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Info Database Last Updated 08.04.2024 (Entity News entries: 76)
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining World. Volume: 27 [XXVII], Issue No. 10Info Publication Date:
September 7, 1907Info found on page:
406Info Title:
District Portland Mill Rumor Denver—It was announced some time ago that the management of the Portland would erect a large plant at its mine, and while the work is not yet under way, it is very probable that a beginning will be made this fall.
Notes/Text been Edited:
AbstractedInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 406
- Hathi Trust Digital Library: ⊞ The Mining World, Vol. 27 (July-December 1907)
Above Info was Last Updated on 02.12.2023 (08:37:12)
Above Info was First Seen 02.12.2023
Type/Category of Info:
ArticleInfo Source From:
Mining and Scientific Press. Volume: 96 [XCVI], Issue No. 2487; 12Info Publication Date:
March 21, 1908Info found on page:
397Info Title:
Portland Cyanide Mill Precipitation Room Info Pieces The precipitation room of the cyanide plant at the Portland mine, Colorado, contains 18 rows of zinc boxes, each row having six compartments 4 by 4 by 4 ft. and pyramidal in shape at the bottom. A 14-mesh wire screen supported by a 2-in. angle iron riveted on the inside, 20 in. above the lowest point of the pyramid forms the false bottom.
These boxes are supported on timbers high enough above the cement floor to permit a man to stand up to work about them. The solution enters the first box through a false compartment, flows under the screen, then up through the zinc and over into the next compartment; 28 in. is the distance from the screen to the overflow of each compartment.
A 12 by 12 in. wooden launder beneath each row of boxes carries the discharge to a launder of the same dimensions, which discharges into a steel vat with capacity for holding all of the solution from one row of zinc-boxes during a clean-up. It is connected to a 2-in. centrifugal pump which lifts the contents 30 ft. to a lead-lined tank. A hood having a 12 by 12-in. opening in the centre for the escaping fumes during a clean-up is built over the tank.
Twelve sets of zinc-boxes are in use; each compartment is packed with 200 lb. of zinc shavings previously dipped in a 2% acetate of lead solution. Strong solution having 0.6 lb. cyanide per ton and a protective alkalinity 0.5 to 1.0 lb. flows through six rows of boxes, and a weak solution—the strength of cyanide per ton of solution being 0.3 to 0.4 lb. and protective alkalinity, neutral to 0.2 lb.—flows through the other six boxes.
These boxes are supported on timbers high enough above the cement floor to permit a man to stand up to work about them. The solution enters the first box through a false compartment, flows under the screen, then up through the zinc and over into the next compartment; 28 in. is the distance from the screen to the overflow of each compartment. A 12 by 12 in. wooden launder beneath each row of boxes carries the discharge to a launder of the same dimensions, which discharges into a steel vat with capacity for holding all of the solution from one row of zinc-boxes during a clean-up. It is connected to a 2-in. centrifugal pump which lifts the contents 30 ft. to a lead-lined tank. A hood having a 12 by 12-in. opening in the centre for the escaping fumes during a clean-up is built over the tank. Twelve sets of zinc-boxes are in use; each compartment is packed with 200 lb. of zinc shavings previously dipped in a 2% acetate of lead solution. Strong solution having 0.6 lb. cyanide per ton and a protective alkalinity 0.5 to 1.0 lb. flows through six rows of boxes, and a weak solution—the strength of cyanide per ton of solution being 0.3 to 0.4 lb. and protective alkalinity, neutral to 0.2 lb.—flows through the other six boxes.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 397
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press Vol.96 (January-June 1908)
Above Info was Last Updated on 19.12.2023 (08:30:49)
Above Info was First Seen 05.08.2023
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining World. Volume: 29 [XXIX], Issue No. 5Info Publication Date:
August 1, 1908Info found on page:
178Info Title:
Portland Local Cyanide Mill Plans Cripple Creek—The great Portland Mining Co., which has for two years been considering the erection of a large cyanide plant at the mine to handle the enormous tonnage of dump material and also the vast amount of low-grade ore in its miles of drifts and slopes is now practically prepared to go ahead with the project.
It is stated that Frank Peck, the present manager, is about to put the scheme into practicable shape.
It is stated that Frank Peck, the present manager, is about to put the scheme into practicable shape.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 178
- Hathi Trust Digital Library: ⊞ The Mining World, Vol. 29 (July-December 1908)
Above Info was Last Updated on 30.12.2023 (08:24:55)
Above Info was First Seen 30.12.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 58 [LVIII], Issue No. 9Info Publication Date:
August 27, 1908Info found on page:
176Info Title:
Portland Gold Mining Co. Starts Work on New Mill Work has been started on the Portland Co.'s mill, which will be located near the city reservoirs on Battle Mtn. The plant will have a capacity of 500 tons.
Excavations for the foundations are being made and the machinery is arriving.
Excavations for the foundations are being made and the machinery is arriving.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 176
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 58; July to December 1908
Above Info was Last Updated on 01.04.2023 (07:50:51)
Above Info was First Seen 15.06.2010
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining World. Volume: 29 [XXIX], Issue No. 9Info Publication Date:
August 29, 1908Info found on page:
330Info Title:
Portland Cyanide Mill in Course of Construction Cripple Creek—The new Portland cyanide mill is in course of construction and it is expected to be ready for the installation of machinery, which is all on the ground, in the course of two or three weeks. It will have a capacity of 500 tons per day.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 330
- Hathi Trust Digital Library: ⊞ The Mining World, Vol. 29 (July-December 1908)
Above Info was Last Updated on 31.12.2023 (13:26:05)
Above Info was First Seen 31.12.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 58 [LVIII], Issue No. 12Info Publication Date:
September 17, 1908Info found on page:
237Info Title:
Portland G. M. Co. Experimental Plant Soon Ready Work on the experimental plant of the Portland G. M. Co. is being pushed rapidly and it is expected that the mill will be in full operation some time during the present month.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 237
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 58; July to December 1908
Above Info was Last Updated on 03.04.2023 (20:17:00)
Above Info was First Seen 15.06.2010
Type/Category of Info:
General Mining NewsInfo Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2534; 7Info Publication Date:
February 13, 1909Info found on page:
236Info Title:
Portland Gold Mining Co. Proposes a Local Mill at Victor At the annual stockholders' meeting of the Portland Gold Mining Co. it was learned the company has been trying the Tippet-Crowe and Moore-Clancy processes on its ore and also a process which will be known as the Portland process.
These tests have sufficiently demonstrated that crude ore can now be treated, thus effecting a saving of 76 cents per ton for roasting and $1 per ton for transport to Colorado Springs.
The company now proposes to erect, at an early date, a 300 or 500-ton mill at Victor to put the Portland process into practical operation.
These tests have sufficiently demonstrated that crude ore can now be treated, thus effecting a saving of 76 cents per ton for roasting and $1 per ton for transport to Colorado Springs. The company now proposes to erect, at an early date, a 300 or 500-ton mill at Victor to put the Portland process into practical operation.Notes/Text been Edited:
Abstracted and slightly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and scientific press. v.98 Jan.-June 1909.
Above Info was Last Updated on 16.04.2022 (19:47:01)
Above Info was First Seen 16.04.2022
Type/Category of Info:
General Mining NewsInfo Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2543; 16Info Publication Date:
April 17, 1909Info found on page:
537Info Title:
Portland Gold Mining Co. Happenings At the directors meeting of the Portland Gold Mining Co. the regular quarterly dividend was declared, but at the rate of 3c. instead of 4, as formerly. The reduction is said to be for the purpose of holding a reserve for mill construction. By next meeting the directors will have decided the capacity of the plant to be installed.
The Clancy process will be used, thereby obviating roasting.
The Clancy process will be used, thereby obviating roasting.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and scientific press. v.98 Jan.-June 1909.
Above Info was Last Updated on 19.04.2022 (08:29:06)
Above Info was First Seen 19.04.2022
Type/Category of Info:
ArticleInfo Source From:
Mines and Minerals. Volume: 29 [XXIX], Issue No. 10Info Publication Date:
May 1909Info found on page:
444Info Title:
Portland Cyanide Work For several years past Colorado metallurgists have been attempting to solve the metallurgical puzzle presented by the low-grade ores of Cripple Creek. Millions of tons of ore running from $3 to $10 per ton have lain on the great dumps for years, while other millions were exposed in hundreds of miles of underground workings.
The Portland company alone had enough low-grade ore in its forty odd miles of workings to materially increase the Cripple Creek gold production provided a method of profitable treatment could be devised.
Shipping the ore to the Colorado Springs reduction plant of the company cost $1 per ton, roasting the ore cost $.76 per ton, and the other milling expenses ate up the small margin of profit.
Thus, for some years previous to 1907, the issues were clearly presented, first, to eliminate roasting the ores if possible, and, second, to eliminate freight charges by building mills at the mines.
It will, of course, be understood that until a way of eliminating the roasting of the tellurium ores was discovered, it would be useless to erect mills at the Cripple Creek mines where roasting costs even more than at Colorado Springs.
During the two years in which the Stratton Independence and Golden Cycle metallurgists have been evolving their plants, those of the Portland company have also been most active.
It is now common knowledge that the widely advertised Moore-Clancy process was given an extended trial at the experimental mill of the company but was evidently found unsuitable. The great amount of experimental work, however, did result in the evolution of what is known as the "Portland process," whose details are as yet unavailable.
It has been thoroughly tried out at the company's Cripple Creek 10-stamp experimental plant, however, with such success that a large mill is soon to be built close to the mines.
The annual report of the company recently issued says that from many tests the company is convinced that the problem of treating the low-grade dump ores has been solved.
The directors have decided to back up their judgment by the expenditure of at least $100,000 for a 300-ton mill, erected near the mine on Battle Mountain, to treat the great company dumps. These contain enough ore to run the mill for many years at an estimated net profit of from $1 to $2.50 per ton.
The Portland company alone had enough low-grade ore in its forty odd miles of workings to materially increase the Cripple Creek gold production provided a method of profitable treatment could be devised. Shipping the ore to the Colorado Springs reduction plant of the company cost $1 per ton, roasting the ore cost $.76 per ton, and the other milling expenses ate up the small margin of profit. Thus, for some years previous to 1907, the issues were clearly presented, first, to eliminate roasting the ores if possible, and, second, to eliminate freight charges by building mills at the mines. It will, of course, be understood that until a way of eliminating the roasting of the tellurium ores was discovered, it would be useless to erect mills at the Cripple Creek mines where roasting costs even more than at Colorado Springs. During the two years in which the Stratton Independence and Golden Cycle metallurgists have been evolving their plants, those of the Portland company have also been most active. It is now common knowledge that the widely advertised Moore-Clancy process was given an extended trial at the experimental mill of the company but was evidently found unsuitable. The great amount of experimental work, however, did result in the evolution of what is known as the "Portland process," whose details are as yet unavailable. It has been thoroughly tried out at the company's Cripple Creek 10-stamp experimental plant, however, with such success that a large mill is soon to be built close to the mines. The annual report of the company recently issued says that from many tests the company is convinced that the problem of treating the low-grade dump ores has been solved. The directors have decided to back up their judgment by the expenditure of at least $100,000 for a 300-ton mill, erected near the mine on Battle Mountain, to treat the great company dumps. These contain enough ore to run the mill for many years at an estimated net profit of from $1 to $2.50 per ton.Notes/Text been Edited:
Abstracted from a somewhat longer text about Cyaniding Cripple Creek Dumps.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Mines and Minerals; Volume 29 (Aug 1908-July 1909)
- Hathi Trust Digital Library: ⊞ Direct to Page 444
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 22.03.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Western Investors Review. Volume: 15 [XV], Issue No. 11Info Publication Date:
June 1909Info found on page:
10Info Title:
Portland Gold Mining Co. Announced New Cyanide Mill Following a meeting of the directors of the Portland Gold Mining company here today, announcement was made that the company has definitely decided to build its proposed large cyanide mill in the vicinity of the mine at Victor.
This has been under consideration since the company's chemist worked out a method of treating low grade ore by cyaniding without roasting, which involves less cost than any other known process.
This has been under consideration since the company's chemist worked out a method of treating low grade ore by cyaniding without roasting, which involves less cost than any other known process.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 10
- Hathi Trust Digital Library: ⊞ The Western Investors Review, Vol.15 (June 1908-August 1909)
Above Info was Last Updated on 24.08.2023 (10:34:45)
Above Info was First Seen 24.08.2023
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
Mining and Scientific Press. Volume: 98 [XCVIII], Issue No. 2553; 26Info Publication Date:
June 26, 1909Info found on page:
880Info Title:
New Portland Mill Construction Soon to Commence DENVER, COLORADO—At Cripple Creek work will shortly commence on the construction of the Portland G. M. Co.'s mill. The site selected is midway between No. 2 and No. 3 shafts, on the northeast slope of Battle mountain.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and scientific press. v.98 Jan.-June 1909.
Above Info was Last Updated on 21.04.2022 (10:15:30)
Above Info was First Seen 21.04.2022
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 60 [LX], Issue No. 1536Info Publication Date:
July 8, 1909Info found on page:
37Info Title:
New Portland Mill Excavating & Grading Commenced Work commenced today on the grading of the road-beds to the millsite selected by the Portland Co. for its new mill. The contract calls for completion of the road in 30 days, so as to permit the delivery of building material and machinery for the plant.
Excavating for the millsite has commenced.
Excavating for the millsite has commenced.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining Science - Jul-Des 1909
Above Info was Last Updated on 20.03.2022 (22:18:10)
Above Info was First Seen 20.06.2010
Type/Category of Info:
General Mining NewsInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2555; 2Info Publication Date:
July 10, 1909Info found on page:
43Info Title:
New Portland Mill Excavating & Grading Commenced Work has commenced on the excavations and road-bed at the site of the new mill to be constructed by the Portland Gold Mining Co. on Battle mountain for the local treatment of such low-grade ores as will not pay for the transportation to the mill of the company at Colorado City. The plant is to have an initial capacity of 300 tons per day, and will be so constructed as to permit of enlargement.
The mine is shipping between 200 and 250 tons per day to the Colorado City plant, and this tonnage will be maintained.
The mine is shipping between 200 and 250 tons per day to the Colorado City plant, and this tonnage will be maintained.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 21.04.2022 (23:30:33)
Above Info was First Seen 21.04.2022
Type/Category of Info:
General Mining NewsInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2558; 5Info Publication Date:
July 31, 1909Info found on page:
139Info Title:
Foundation Work for New Portland Mill The Portland Gold Mining Co. of Victor has commenced grading for the foundations of its new mill between No. 2 and 3 shafts on Battle mountain. Frank M. Kurie is manager.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 22.04.2022 (09:30:25)
Above Info was First Seen 22.04.2022
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2559; 6Info Publication Date:
August 7, 1909Info found on page:
180Info Title:
Small Labor War Around Grading for Portland Mill DENVER, COLORADO—A small labor war was precipitated recently by the contractors on the grading for the new Portland mill importing Italian laborers for the work. The Italians were run out of camp and one shot in the ensuing fracas.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 23.04.2022 (07:29:34)
Above Info was First Seen 23.04.2022
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 60 [LX], Issue No. 1545Info Publication Date:
September 9, 1909Info found on page:
235Info Title:
Portland Battle Mountain Mill Expected to Be Ready in November Work is progressing satisfactorily to the management of the Portland Co. with the new plant, and the mill should be ready for operation by the middle of November.
Notes/Text been Edited:
Abstracted from somewhat larger text infoInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining Science - Jul-Des 1909
Above Info was Last Updated on 10.04.2022 (13:55:53)
Above Info was First Seen 10.04.2022
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2569; 16Info Publication Date:
October 16, 1909Info found on page:
522Info Title:
New Portland Mill Progressing DENVER, COLORADO—Construction work on the new Portland mill is progressing rapidly.
Notes/Text been Edited:
AbstractedInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 28.04.2022 (09:56:17)
Above Info was First Seen 28.04.2022
Type/Category of Info:
General Mining NewsInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2571; 18Info Publication Date:
October 30, 1909Info found on page:
579Info Title:
Portland New Mill Has Machinery on Ground The structural steel work for the new mill of the Portland Gold Mining Co. is nearly complete, and the machinery is on the ground. It is expected that the plant will be ready for operation by the first of the year.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 28.04.2022 (12:19:00)
Above Info was First Seen 28.04.2022
Type/Category of Info:
Correspondence and DiscussionInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2574; 21Info Publication Date:
November 20, 1909Info found on page:
691Info Title:
Portland New Mill Said to Use the Clancy ProcessResearches Upon Cripple Creek Telluride Ore.
The Editor:
Sir—As the Mining and Scientific Press was one of several American journals that published an article 'edited by Thomas B. Crowe', which appeared in the Chemical, Metallurgical & Mining Society's Journal, I beg to hand you herewith a copy of a communication that I am addressing to the society referred to, which might interest your readers.
"Chemical, Metallurgical & Mining Society, of South Africa, Johannesburg, South Africa.
Gentlemen—Several American mining journals having published an article 'edited by Thomas B. Crowe', which evidently appeared in your journal, we have thought it might interest your membership to know that the process which Mr. Crowe describes, is not one of his invention as you might infer, but the invention of John Collins Clancy. It is the subject of Transvaal Patent, No. 90, of 1909.
Further, the same Thomas B. Crowe was Mr. Clancy's second assistant during a portion of the time that Mr. Clancy was the chief chemist of the Portland Gold Mining Co., at the time that Mr. Clancy successfully demonstrated the working of his process for the treatment of telluride ores on a large commercial scale without roasting. It was during this period of association that Mr. Clancy gave Mr. Crowe access to all of his books and data.
"It would hardly seem necessary to add anything further than to say that the Portland company is working under a written executed license-agreement from Mr. Clancy to use his process, and that the successful operation of the new 300-ton plant which that company is now building on its own mine at Victor, Colorado, is based upon the success of the exhaustive demonstrations made with the Clancy non-roasting process."
HENRY B. HAIGH.
The Editor: Sir—As the Mining and Scientific Press was one of several American journals that published an article 'edited by Thomas B. Crowe', which appeared in the Chemical, Metallurgical & Mining Society's Journal, I beg to hand you herewith a copy of a communication that I am addressing to the society referred to, which might interest your readers."Chemical, Metallurgical & Mining Society, of South Africa, Johannesburg, South Africa. Gentlemen—Several American mining journals having published an article 'edited by Thomas B. Crowe', which evidently appeared in your journal, we have thought it might interest your membership to know that the process which Mr. Crowe describes, is not one of his invention as you might infer, but the invention of John Collins Clancy. It is the subject of Transvaal Patent, No. 90, of 1909. Further, the same Thomas B. Crowe was Mr. Clancy's second assistant during a portion of the time that Mr. Clancy was the chief chemist of the Portland Gold Mining Co., at the time that Mr. Clancy successfully demonstrated the working of his process for the treatment of telluride ores on a large commercial scale without roasting. It was during this period of association that Mr. Clancy gave Mr. Crowe access to all of his books and data. "It would hardly seem necessary to add anything further than to say that the Portland company is working under a written executed license-agreement from Mr. Clancy to use his process, and that the successful operation of the new 300-ton plant which that company is now building on its own mine at Victor, Colorado, is based upon the success of the exhaustive demonstrations made with the Clancy non-roasting process."HENRY B. HAIGH.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 30.04.2022 (22:57:43)
Above Info was First Seen 30.04.2022
Type/Category of Info:
Correspondence and DiscussionInfo Source From:
Mining and Scientific Press. Volume: 99 [XCIX], Issue No. 2579; 26Info Publication Date:
December 25, 1909Info found on page:
859Info Title:
Clancy Process Not Used by Any Portland MillResearches upon Cripple Creek Telluride Ore.
The Editor:
Sir—Kindly give publicity to this letter in reply to Henry B. Haigh's article in your issue of November 20.
John Collins Clancy was never chief chemist of the Portland mill. He worked in our laboratory a few months at day's pay. J. M. Tippett was and is the only chief chemist we ever had and Thos. B. Crowe was his assistant before his promotion. The use of cyanogen iodide in connection with potassium cyanide as a solvent for telluride of gold and the manner of producing it in contact with the ore, was the invention of Mr. Crowe and Mr. Tippett and was never claimed by Mr. Clancy until after he left the service of the Portland company.
Our laboratory notes from day to day show this, and Mr. Clancy was not even in the State of Colorado when the experiments were made, as shown by the company's records. The process was abandoned by the Portland company over a year ago on account of the high cost of the chemicals used.
The Portland company is not now using in its new mill or any of its old mills any process Mr. Clancy ever used during the short time he was with the Portland company: or any chemical ever suggested by him to us, or any process, or chemical that could be construed as relating to any patent or suggestion of his, even in the most remote manner.
The Portland Gold Mining Co.,
By Frank G. Peck, President.
Colorado Springs, Colorado, December 2.
The Editor: Sir—Kindly give publicity to this letter in reply to Henry B. Haigh's article in your issue of November 20. John Collins Clancy was never chief chemist of the Portland mill. He worked in our laboratory a few months at day's pay. J. M. Tippett was and is the only chief chemist we ever had and Thos. B. Crowe was his assistant before his promotion. The use of cyanogen iodide in connection with potassium cyanide as a solvent for telluride of gold and the manner of producing it in contact with the ore, was the invention of Mr. Crowe and Mr. Tippett and was never claimed by Mr. Clancy until after he left the service of the Portland company. Our laboratory notes from day to day show this, and Mr. Clancy was not even in the State of Colorado when the experiments were made, as shown by the company's records. The process was abandoned by the Portland company over a year ago on account of the high cost of the chemicals used. The Portland company is not now using in its new mill or any of its old mills any process Mr. Clancy ever used during the short time he was with the Portland company: or any chemical ever suggested by him to us, or any process, or chemical that could be construed as relating to any patent or suggestion of his, even in the most remote manner.The Portland Gold Mining Co.,By Frank G. Peck, President.Colorado Springs, Colorado, December 2.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
- Hathi Trust Digital Library: ⊞ Mining and Scientific Press. v.99 July-Dec.1909.
Above Info was Last Updated on 30.04.2022 (23:01:14)
Above Info was First Seen 30.04.2022
Type/Category of Info:
ArticleInfo Source From:
The Mining Magazine. Volume: 2 [II], Issue No. 2Info Publication Date:
February 1910Info found on page:
107Info Title:
Portland Battle Mountain Mill Nearly Completed The striking feature of the year, metallurgically, was this development of mills. The Portland company has nearly completed a 400-ton plant to treat low-grade ore and dumps.
Details have not been made public, but it is known to be a non-roasting process whereby tellurides are broken up and the gold dissolved as in cyanidation. The exact solvent used is a secret, the process having been discovered in the company's own laboratory.
It is enthusiastically claimed that it will be possible to treat profitably all ore worth more than $1 per ton. The mill is situated on the east slope of Battle mountain near Shaft No. 2.
The dump, which is estimated to contain 2,000,000 tons, is to be handled by caving, the ore being delivered to electric cars in a drift below. These will carry it to the shaft where it will be hoisted and delivered to bins of 500 tons capacity. The bins are of steel construction, cylindrical in shape, 36 ft. high and 26 in. diam.
The bottoms are of concrete, and the ore is to form its own angle of test, being drawn on a steel conveyor, 4 ft. wide and of variable speed. This principle, by the way, has been applied with marked success in the coarse - crushing plant of the Boston plant at Bingham, Utah.
The ore at the Portland is to pass from the conveyor under magnets to remove stray nails and steel. From the magnets it goes over a grizzley, which delivers the coarse to a large Blake crusher. From the crusher it goes to two sets of 24 by 48 in. Colorado Iron Works rolls set tandem with impact screens between.
These are said to be the largest rolls used in a Colorado mill and have an estimated capacity of 1200 tons per 24 hours, crushing to 3/8 in. From the rolls the ore goes by conveyor belt to four Akron 6-ft. Chilean mills through storage-bins with automatic feed.
It is to be crushed here to 30 mesh in cyanide, and the new solution, and to travel next to concentrating tables. The concentrate will flow by gravity to a 1000-ton bin having a filter-bottom through which the solution is to drain.
From the bin the concentrate may be dumped into freight cars and shipped to the company's mill at Colorado City for further treatment. The tailing from the tables will be sent through Akins spiral classifiers, the slime passing to Rothwell de-waterers, and the sand to second and third Akins classifiers to be washed with fresh water and thrown away.
The slime from the Rothwell de-waterers will be sent to a canvas plant for further treatment and concentration and finally through six agitating-tanks 36 ft. high and 20 in. diam. to revolving filters somewhat similar to the Oliver, and thence to the precipitation room.
The whole mill is being built with an eye to automatic operation and low running costs. J. M. Tippett, the chemist, and Thos. B. Crowe, the metallurgist, have the best wishes of the camp and the profession back of them.
It may be noted that in the use of concentrating tables, the Portland will resemble the Stratton's Independence mill. It will differ essentially in the introduction of a new solvent supplementary to cyanide.
Details have not been made public, but it is known to be a non-roasting process whereby tellurides are broken up and the gold dissolved as in cyanidation. The exact solvent used is a secret, the process having been discovered in the company's own laboratory. It is enthusiastically claimed that it will be possible to treat profitably all ore worth more than $1 per ton. The mill is situated on the east slope of Battle mountain near Shaft No. 2. The dump, which is estimated to contain 2,000,000 tons, is to be handled by caving, the ore being delivered to electric cars in a drift below. These will carry it to the shaft where it will be hoisted and delivered to bins of 500 tons capacity. The bins are of steel construction, cylindrical in shape, 36 ft. high and 26 in. diam. The bottoms are of concrete, and the ore is to form its own angle of test, being drawn on a steel conveyor, 4 ft. wide and of variable speed. This principle, by the way, has been applied with marked success in the coarse - crushing plant of the Boston plant at Bingham, Utah. The ore at the Portland is to pass from the conveyor under magnets to remove stray nails and steel. From the magnets it goes over a grizzley, which delivers the coarse to a large Blake crusher. From the crusher it goes to two sets of 24 by 48 in. Colorado Iron Works rolls set tandem with impact screens between. These are said to be the largest rolls used in a Colorado mill and have an estimated capacity of 1200 tons per 24 hours, crushing to 3/8 in. From the rolls the ore goes by conveyor belt to four Akron 6-ft. Chilean mills through storage-bins with automatic feed. It is to be crushed here to 30 mesh in cyanide, and the new solution, and to travel next to concentrating tables. The concentrate will flow by gravity to a 1000-ton bin having a filter-bottom through which the solution is to drain. From the bin the concentrate may be dumped into freight cars and shipped to the company's mill at Colorado City for further treatment. The tailing from the tables will be sent through Akins spiral classifiers, the slime passing to Rothwell de-waterers, and the sand to second and third Akins classifiers to be washed with fresh water and thrown away. The slime from the Rothwell de-waterers will be sent to a canvas plant for further treatment and concentration and finally through six agitating-tanks 36 ft. high and 20 in. diam. to revolving filters somewhat similar to the Oliver, and thence to the precipitation room. The whole mill is being built with an eye to automatic operation and low running costs. J. M. Tippett, the chemist, and Thos. B. Crowe, the metallurgist, have the best wishes of the camp and the profession back of them. It may be noted that in the use of concentrating tables, the Portland will resemble the Stratton's Independence mill. It will differ essentially in the introduction of a new solvent supplementary to cyanide.Notes/Text been Edited:
Abstracted from source textInternet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (February 1910; p107)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 61 [LXI], Issue No. 1579Info Publication Date:
May 5, 1910Info found on page:
427Info Title:
Portland Battle Mountain Mill to Commence May 1 The finishing touches are being put to the Portland Gold M. Co.'s new mill and the machinery is geared up and about ready to commence crushing. The date set for commencement is May 1.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 427
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; January to June 1910
Above Info was Last Updated on 19.04.2023 (12:15:45)
Above Info was First Seen 19.04.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1588Info Publication Date:
July 7, 1910Info found on page:
18Info Title:
Portland's Victor/Battle Mtn. Mill June 1910 Output During June operation at the Portland G. M. Co., new Battle Mountain mill commenced. This plant uses the secret process invented by the company's employees and is handling the low-grade dump ores with success. Ore of as low an average grade as $2.46 per ton was put through the mill during the month, and the profit is said to exceed $1 a ton. No official figures as to the actual saving have been made public, though the amount handled is placed at 8,863 tons. The plant processed 8,863 tons with an average value of $2.46 and a total value of $21,802.98.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 18
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 24.04.2023 (09:50:48)
Above Info was First Seen 11.07.2010
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 2Info Publication Date:
July 9, 1910Info found on page:
86Info Title:
Portland Mill, Victor/Battle Mtn. Production; June 1910 Denver, July 2—The New Portland mill appeared in the list of reduction works treating Cripple Creek ores for the first time last month, 8863 tons of an average value of $2.46 having been handled.
The cost of treatment has not been made known to the public, but it is stated to be about $1 per ton.
The cost of treatment has not been made known to the public, but it is stated to be about $1 per ton.Notes/Text been Edited:
Abstracted and slightly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
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Above Info was Last Updated on 27.04.2023 (13:17:52)
Above Info was First Seen 18.12.2021
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 5Info Publication Date:
July 30, 1910Info found on page:
230Info Title:
Portland Battle Mountain Mill Formal Opened in June Denver, July 25—The Portland Gold Mining Company's new 300-ton mill, erected at the mine near Victor, at a cost of $250,000, has sent out its first bullion valued at about $9000, and held a formal opening June 19, at which all the mine managers of Cripple Creek, bank presidents, railway heads, and metallurgists from other parts of the State were present.
The process of reduction at the Portland mill is described as cyaniding, together with what is called a secret process, owned by the company.
The mine is producing 550 tons per diem, 300 tons of which is treated at this mill, and not the dump ore, as has been stated. The president informed the visitors that the mill was running at a profit, and the percentage of saving higher than was expected, but no official statement was made of the grade of ore being milled, or the cost of treatment.
The capitalization of this company is $3,000,000, and the dividends paid to date amount to $9,037,080.
The process of reduction at the Portland mill is described as cyaniding, together with what is called a secret process, owned by the company. The mine is producing 550 tons per diem, 300 tons of which is treated at this mill, and not the dump ore, as has been stated. The president informed the visitors that the mill was running at a profit, and the percentage of saving higher than was expected, but no official statement was made of the grade of ore being milled, or the cost of treatment. The capitalization of this company is $3,000,000, and the dividends paid to date amount to $9,037,080.Notes/Text been Edited:
Abstracted from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
Above Info was Last Updated on 19.12.2021 (10:11:18)
Above Info was First Seen 19.12.2021
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1592Info Publication Date:
August 4, 1910Info found on page:
116Info Title:
Portland Co. Mill(s) Gets Stratton Estate Ore The ore from the Stratton estate is shipped to the Portland Co., and it is said the proposed mill on Globe Hill will be constructed on similar lines and use the same process as the Battle Mountain plant of that company.
Notes/Text been Edited:
Abstracted and slightly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 116
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 27.04.2023 (09:25:50)
Above Info was First Seen 27.04.2023
Type/Category of Info:
Correspondence and DiscussionInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1593Info Publication Date:
August 11, 1910Info found on page:
131Info Title:
Skepticisms to the Portland Process HAS ROASTING BEEN ELIMINATED IN CYANIDING?
———
Does the New Portland Process Represent Any Advance in the Treatment Given to the Sands?
———
By John R. Wood.
Secretary of the Boulder County Metal Mining Association.
From what I have been able to learn of the new Portland mill, I fail to see that it represents any remarkable advance in the treatment of ore by the cyanide process.
I have not had an opportunity to visit the mill personally, but I have talked with several who have, I have read the description published in Mining Science, July 28, and it looks very much to me as though the "mountain had labored and brought forth a mouse."
It is announced that the use of the special solution, or "googoo," eliminates roasting, bringing the recovery up from 60% or 70% to 90% or better, and that this is done at a cost of less than 10 cents a ton, whereas the cost of roasting is from 40 to 60. cents a ton.
But it should be noted that the special solution is used only on the slimes. The concentrates are shipped to the company's mill at Colorado City.
I do not know what percentage of the ore these concentrates form, but certainly they are a very considerable part of it, and for this part roasting is not eliminated. The problem of treating the sands without roasting is a very different one from treating the slimes, and so far as I can see we are no nearer to a solution of it than we were before.
At the Portland mill, the total cost of treatment is said to be less than one dollar a ton, but to this, it seems, we must add the expense of subsequent treatment of the concentrates. At the Golden Cycle mill the total cost of treating all the ore, including roasting, I am told, will not run over $1.25 a ton, and is probably nearer $1.15.
Taking everything into consideration, will the new Portland mill make any better showing?
———Does the New Portland Process Represent Any Advance in the Treatment Given to the Sands?———By John R. Wood.Secretary of the Boulder County Metal Mining Association. From what I have been able to learn of the new Portland mill, I fail to see that it represents any remarkable advance in the treatment of ore by the cyanide process. I have not had an opportunity to visit the mill personally, but I have talked with several who have, I have read the description published in Mining Science, July 28, and it looks very much to me as though the "mountain had labored and brought forth a mouse." It is announced that the use of the special solution, or "googoo," eliminates roasting, bringing the recovery up from 60% or 70% to 90% or better, and that this is done at a cost of less than 10 cents a ton, whereas the cost of roasting is from 40 to 60. cents a ton. But it should be noted that the special solution is used only on the slimes. The concentrates are shipped to the company's mill at Colorado City. I do not know what percentage of the ore these concentrates form, but certainly they are a very considerable part of it, and for this part roasting is not eliminated. The problem of treating the sands without roasting is a very different one from treating the slimes, and so far as I can see we are no nearer to a solution of it than we were before. At the Portland mill, the total cost of treatment is said to be less than one dollar a ton, but to this, it seems, we must add the expense of subsequent treatment of the concentrates. At the Golden Cycle mill the total cost of treating all the ore, including roasting, I am told, will not run over $1.25 a ton, and is probably nearer $1.15. Taking everything into consideration, will the new Portland mill make any better showing?Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 131
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 27.04.2023 (09:50:19)
Above Info was First Seen 27.04.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1593Info Publication Date:
August 11, 1910Info found on page:
139Info Title:
Portland Mill, Victor/Battle Mtn. Mill July 1910 Output The Portland Co.'s new mill on Battle mountain operated successfully during July and an increased valuation is reported, although the tonnage was lighter by reason of the holidays and the loss of 36 hours by the shutting off of electric power during storms. The plant processed 8,643 tons with an average value of $3.32 and a bullion value of $28,694.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 139
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 27.04.2023 (13:18:04)
Above Info was First Seen 27.04.2023
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 7Info Publication Date:
August 13, 1910Info found on page:
332Info Title:
Portland Victor Mill Stuff Denver, Aug. 6—Referring to the new Portland mill at Victor, mentioned in the JOURNAL of July 30, it is now freely stated that by eliminating the preliminary roast of the sulpho-telluride ores, and substituting the addition of a special solution in the agitators, the saving on the low-grade ore (which averages $4 per ton) is brought up to 90 per cent., and at a reduced cost of 40c. over the roasting method.
The total cost of treatment is said to be $1 per ton. These statements, however, are not officially made by the Portland company.
No information has been given out as to the exact nature of the special solution, though cyanogen iodide has been indicated. The reason for keeping it secret at present is said to be some threatened trouble as to patents.
The total cost of treatment is said to be $1 per ton. These statements, however, are not officially made by the Portland company. No information has been given out as to the exact nature of the special solution, though cyanogen iodide has been indicated. The reason for keeping it secret at present is said to be some threatened trouble as to patents.Notes/Text been Edited:
Abstracted from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
Above Info was Last Updated on 20.12.2021 (07:27:16)
Above Info was First Seen 24.03.2010
Type/Category of Info:
ArticleInfo Source From:
The Mining Magazine. Volume: 3 [III], Issue No. 3Info Publication Date:
September 1910Info found on page:
181Info Title:
Portland Battle Mountain Mill Opened in July The most notable event of July month, undoubtedly, was the opening of the new mill of the Portland Gold Mining Co., situated near the mine on Battle Mountain and designed to treat ore too low in grade to stand shipment to Colorado City.
The process is one of concentration followed by cyanidation. The only peculiarity in the treatment is the addition of a secret chemical to the slime-pulp going to the agitators. Owing to threatened patent litigation the company has not published details regarding this.
The ore sent to this mill assays $2.40 per ton and it is stated that the net profit is 75c. per ton.
The process is one of concentration followed by cyanidation. The only peculiarity in the treatment is the addition of a secret chemical to the slime-pulp going to the agitators. Owing to threatened patent litigation the company has not published details regarding this. The ore sent to this mill assays $2.40 per ton and it is stated that the net profit is 75c. per ton.Notes/Text been Edited:
Abstracted and partly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (September 1910; p181)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1597Info Publication Date:
September 8, 1910Info found on page:
236Info Title:
Portland's Victor/Battle Mtn. Mill August 1910 Output During August the new Portland mill worked to full capacity, lacking only 100 tons of handling 9,000 tons, as it processed 8,900 tons with an average value of $3.40 and a bullion value of $30,260.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 236
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 28.04.2023 (12:21:45)
Above Info was First Seen 28.04.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1606Info Publication Date:
November 10, 1910Info found on page:
453Info Title:
Portland's Victor/Battle Mtn. Mill October 1910 Output During October the Portland plant on Battle Mountain processed 8,500 tons with an average value of $3.60 for a total value of $30,620.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form, I also corrected Typo for Average Value as source number was just wrong!Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 453
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 30.04.2023 (21:24:29)
Above Info was First Seen 30.04.2023
Type/Category of Info:
General Mining NewsInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 23Info Publication Date:
December 3, 1910Info found on page:
1125Info Title:
Portland Victor Mill Treats 100 Tons Daily Portland—The Portland mill, on Battle mountain, is now said to be treating 100 tons per day at a cost of not to exceed $2 per ton.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Link to Page
Above Info was Last Updated on 25.12.2021 (14:22:35)
Above Info was First Seen 26.03.2010
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1610Info Publication Date:
December 8, 1910Info found on page:
558Info Title:
Portland's Victor/Battle Mtn. Mill November 1910 Output That the Portland Battle Mountain plant will be made larger is certain. This work will begin after the first of the year. During November the mill processed 8,750 tons with an average value of $3.50 and a bullion value of $30,625.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
- Hathi Trust Digital Library; Link to Page: ⊞ 558
Above Info was Last Updated on 03.05.2023 (10:03:27)
Above Info was First Seen 12.07.2010
Type/Category of Info:
General Mining NewsInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 24Info Publication Date:
December 10, 1910Info found on page:
1177Info Title:
Portland Victor Mill Success Creates Rumor Portland—Pres. F. G. Peck says that the success of the Battle Mountain mill, which has been treating 800 tons of ore per month, has brought under consideration the question of enlarging it, and that the immense amount of low-grade ore in the district warrants the building of another mill by this company, to treat custom ores.
At present, however, this new enterprise has simply been under discussion.
At present, however, this new enterprise has simply been under discussion.Internet Source Text Link(s) {Found/Seen/Known]:
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Above Info was Last Updated on 25.12.2021 (16:27:13)
Above Info was First Seen 26.03.2010
Type/Category of Info:
General Mining NewsInfo Source From:
The Engineering and Mining Journal. Volume: 90 [XC], Issue No. 26Info Publication Date:
December 24, 1910Info found on page:
1276Info Title:
Portland Victor Mill to Install Chilean Mill Portland—It is stated that the Portland mill on Battle mountain, near Victor, will install a fourth Chilean mill and be ready to treat 400 tons per day soon after Jan. 1.
The extraction is said to be close to 90 per cent, and the average yield of the ore treated, $3.50 per ton.
The extraction is said to be close to 90 per cent, and the average yield of the ore treated, $3.50 per ton. Internet Source Text Link(s) {Found/Seen/Known]:
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Above Info was Last Updated on 26.12.2021 (16:06:48)
Above Info was First Seen 26.03.2010
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 62 [LXII], Issue No. 1613Info Publication Date:
December 29, 1910Info found on page:
635Info Title:
Portland Battle Mountain Mill Prepares for Larger Output The Portland mill, on Battle mountain, will be ready to treat 400 tons a day in the near future, probably soon after the first of the year, inasmuch as a fourth Chilean mill is now being installed.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 635
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 61; July to December 1910
Above Info was Last Updated on 05.05.2023 (22:25:17)
Above Info was First Seen 05.05.2023
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Mining Magazine. Volume: 4 [IV], Issue No. 1Info Publication Date:
January 1911Info found on page:
34Info Title:
Portland Battle Montain Mill News The Portland G.M. Co., the big neighbour of Stratton's Independence, is also meeting with success in handling low-grade ore. The new mill built by this company has been steadily treating ore since July 1 and is now crushing 8000 to 9000 tons per month.
An additional 6-ft. Chilean mill and set of rolls has been purchased which, with more screens also to be put in, will permit 15,000 tons per month to be handled after January 1.
The value of the ore now being crushed is $2.50 to $3 per ton, and the cost of treatment, including tailing loss, less than $2. This cost will be reduced as the capacity of the mill is increased.
An additional 6-ft. Chilean mill and set of rolls has been purchased which, with more screens also to be put in, will permit 15,000 tons per month to be handled after January 1. The value of the ore now being crushed is $2.50 to $3 per ton, and the cost of treatment, including tailing loss, less than $2. This cost will be reduced as the capacity of the mill is increased.Notes/Text been Edited:
AbstractedInternet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (January 1911; p34)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Mining Magazine. Volume: 4 [IV], Issue No. 1Info Publication Date:
January 1911Info found on page:
34Info Title:
Portland Mill, Victor/Battle Mtn. Production; November 1910 During November Shipments from the district to the Portland Battle Mt. Mill amounted to 8,750 tons of an average $3.50 per ton for a total of $30,625.
Notes/Text been Edited:
Abstracted and partly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (January 1911; p34)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 05.05.2021
Type/Category of Info:
Correspondence and DiscussionInfo Source From:
Metallurgical and Chemical Engineering. Volume: 9 [IX], Issue No. 1Info Publication Date:
January 1911Info found on page:
19Info Title:
Portland G.M. Co. Cyaniding Work Probably the most important event in cyaniding during 1910 was the completion and operation of the Cripple Creek mill of the Portland company. The full details of the process have been kept secret, but it is a direct cyanidation of raw ore, with the addition of a substance or mixture, probably a halogen cyanide and an oxidizing substance. The process was worked out by the metallurgical staff of the company.
After coarse crushing the ore is ground in cyanide solution in Chilean mills and concentrated on Wilfley tables. The concentrate is shipped to the old mill at Colorado City. The tailing is classified, the sand being rejected and the slime concentrated on Card tables.
The Card concentrate is shipped to the Colorado City mill, and the tailing thickened, agitated and filtered. Zinc dust precipitation according to Merrill's process is used. The plant has a number of new devices, such as the Akins classifiers and Rothwell & Akins agitating tanks, and Portland continuous revolving slime filters.
The mill is in steady operation on low-grade mine ore, and its successful operation will point the way to the erection of other local mills.
After coarse crushing the ore is ground in cyanide solution in Chilean mills and concentrated on Wilfley tables. The concentrate is shipped to the old mill at Colorado City. The tailing is classified, the sand being rejected and the slime concentrated on Card tables. The Card concentrate is shipped to the Colorado City mill, and the tailing thickened, agitated and filtered. Zinc dust precipitation according to Merrill's process is used. The plant has a number of new devices, such as the Akins classifiers and Rothwell & Akins agitating tanks, and Portland continuous revolving slime filters. The mill is in steady operation on low-grade mine ore, and its successful operation will point the way to the erection of other local mills.Notes/Text been Edited:
Abstracted & slightly rewritten from larger text about 'Status of Metallurgy in Colorado in 1910' p18->20, only taking a part linked to Cripple CreekInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 19
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1911 (Volume 9)
Above Info was Last Updated on 06.02.2023 (13:38:51)
Above Info was First Seen 04.02.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1621Info Publication Date:
February 23, 1911Info found on page:
221Info Title:
Portland Gold Mining Co. Happenings According to the report of President Peck of the Portland Co. the ore treated at the Battle mountain plant came from the mine. The mill has cost to date $307,676.58 and Mr. Peck advises the increasing of the capacity of the mill to 700 tons a day.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 221
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 63; January to June 1911
Above Info was Last Updated on 09.05.2023 (21:47:23)
Above Info was First Seen 09.05.2023
Type/Category of Info:
Industrial/Construction NotesInfo Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1626Info Publication Date:
March 30, 1911Info found on page:
346Info Title:
Dorr Cyanide Machinery Co. Machinery for Portland Battle Mtn. Mill The Dorr Cyanide Machinery Co. of Denver has recently shipped three Dorr thickeners and one Dorr classifier to the Portland Gold Mining Co. for its new mill at Cripple Creek.
Internet Source Text Link(s) {Found/Seen/Known]:
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- Hathi Trust Digital Library: ⊞ Mining Science; Volume 63; January to June 1911
Above Info was Last Updated on 11.05.2023 (12:16:14)
Above Info was First Seen 11.05.2023
Type/Category of Info:
ArticleInfo Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1628Info Publication Date:
April 13, 1911Info found on page:
399Info Title:
Cripple Creek District March 1911 OutputTable has multiple errors; numbers don't match the given sums at the bottom total, neither does the sum per line always! Unknown where errors are, so I made best guesses!
CRIPPLE CREEK ORE PRODUCTION.
———
According to statements of the smelter and mill representatives and the accompanying estimates of values, the output of Cripple Creek mines in March amounted to 73,125 tons, carrying a gross bullion value of $1,358,455. This production is 3,979 tons in excess of that of February for tonnage, and $105,401 in value.
Increases are shown at all of the plants, with the local mills handling an exceptionally heavy tonnage. This output is largely due to the favorable weather condition. The output:
| Plant and location |
Tonnage |
Av. Value |
Total Value |
|---|---|---|---|
| Standard Mill (U. S. R. & R.), Colorado City | 14,350 14,050 |
22.00 $22.54 |
315,700 $316,700 |
| Smelters, Denver & Pueblo | 4,325 4,025 |
65.00 $67.24 |
270,925 $270,625 |
| Golden Cycle, Colorado City | 25,200 25,000 |
$20.00 | 504,000 $500,000 |
| Portland mill, Colorado City | 10,000 | $20.00 | $200,000 |
| Portland mill, Battle Mountain | 8,800 | $3.60 | $31,680 |
| Stratton's Independence, Battle Mountain | 9,250 | $3.40 | 32,450 $31,450 |
| Wild Horse mill, Bull Hill | 12,000 2,000 |
3.00 $4.00 |
13,600 $8,000 |
| Totals | 73,125 | $1,358,455 |
Notes/Text been Edited:
Table has multiple errors; numbers don't match sums at the bottom total, nor does per line always! Unknown where errors are, so I made best guesses!Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 399
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 63; January to June 1911
Above Info was Last Updated on 14.05.2023 (07:30:41)
Above Info was First Seen 13.05.2023
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 63 [LXIII], Issue No. 1637Info Publication Date:
June 15, 1911Info found on page:
624Info Title:
Portland's Victor/Battle Mtn. Mill May 1911 OutputDuring May the Portland plant on Battle Mountain processed 10,075 tons with an average value of $3.753.57 and a bullion value of $35,976.75.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form, also fixed typo for Average ValueInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 624
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 63; January to June 1911
Above Info was Last Updated on 20.05.2023 (08:35:49)
Above Info was First Seen 20.05.2023
Type/Category of Info:
ArticleInfo Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1641Info Publication Date:
July 13, 1911Info found on page:
35Info Title:
Portland's Victor/Battle Mtn. Mill June 1911 Output During June the Portland plant in Cripple Creek processed 8,770 tons with an average value of $3.00 and a bullion value of $26,310.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 35
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 64; July to December 1911
Above Info was Last Updated on 22.05.2023 (08:24:10)
Above Info was First Seen 22.05.2023
Type/Category of Info:
ArticleInfo Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1647Info Publication Date:
August 24, 1911Info found on page:
177Info Title:
Portland's Victor/Battle Mtn. Mill July 1911 Output During July the Portland's Victor/Battle Mtn. plant processed 9,246 tons with an average value of $3.50 and a bullion value of $32,316.
Notes/Text been Edited:
Abstracted from source text in table and restyled/written to sentence form, and fixed typo for TotalInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 64; July to December 1911
- Hathi Trust Digital Library; Link to Page: ⊞ 177
Above Info was Last Updated on 26.05.2023 (08:32:01)
Above Info was First Seen 26.05.2023
Type/Category of Info:
ArticleInfo Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1647Info Publication Date:
August 24, 1911Info found on page:
182Info Title:
Portland Victor Mill Might Be Enlarged The Portland Gold Mining Co. of Cripple Creek is contemplating the immediate erection of an addition to its Victor mill to make a 500-ton plant instead of 300, as at present.
The Portland mill has proved a success and has done the work which it was planned to do. The tonnage for August will be about the same as that of July and may run close to 10,000 tons.
The Portland mill has proved a success and has done the work which it was planned to do. The tonnage for August will be about the same as that of July and may run close to 10,000 tons.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 182
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 64; July to December 1911
Above Info was Last Updated on 26.05.2023 (08:40:12)
Above Info was First Seen 26.05.2023
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 10Info Publication Date:
September 2, 1911Info found on page:
465Info Title:
Portland's Victor Mill to Get an Addition Denver Aug. 28—The Portland company, of Cripple Creek, is contemplating the immediate erection of an addition to its local mill to increase the capacity from 300 to 500 tons. The process used in the recently completed mill has proved to be successful.
The quantity of ore treated during August will be about the same as that for July and may run close to 10,000 tons. The grade of the ore will be about the same as milled last month.
The quantity of ore treated during August will be about the same as that for July and may run close to 10,000 tons. The grade of the ore will be about the same as milled last month.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Direct to Page 465
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 26.03.2019
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1655Info Publication Date:
October 19, 1911Info found on page:
380Info Title:
Portland Battle Mountain Mill Changes Some changes in the electrical equipment will be made shortly at the New Portland mill in the way of increasing the horse power.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 380
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 64; July to December 1911
Above Info was Last Updated on 05.06.2023 (12:12:28)
Above Info was First Seen 05.06.2023
Type/Category of Info:
General Mining NewsInfo Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 19Info Publication Date:
November 4, 1911Info found on page:
913Info Title:
Portland Victor Mill Results Portland—A statement issued by the company is to the effect that during three months ended Sept. 30, the new mill at the mine treated 29,559 tons of ore at a net profit of $33,110; the net profit from the mill during the first nine months of the year was $100,939.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Direct to Page 913
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 27.03.2019
Type/Category of Info:
Abstracts of Official ReportsInfo Source From:
Mining Science. Volume: 64 [LXIV], Issue No. 1660Info Publication Date:
November 23, 1911Info found on page:
486Info Title:
Portland Gold Mining Co. Battle Mtn Mill Happenings The new mill at the Portland mine at Cripple Creek treated. 29,559 tons of low-grade ore during the three months ending September 30 at a net profit of $33,110.78, according to a statement of the company. The total net profit of the company from the mill during the first nine months of this year was $100,939.16. Additional tanks and other apparatus necessary for treating the concentrates are being put in place at the mill.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 486
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 64; July to December 1911
Above Info was Last Updated on 11.06.2023 (09:43:48)
Above Info was First Seen 11.06.2023
Type/Category of Info:
General Mining NewsInfo Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 24Info Publication Date:
December 9, 1911Info found on page:
1150Info Title:
Portland Battle Mountain Mill November Treatment Portland—The statement is made that the new mill on Battle mountain treated about 12,000 tons in November. The last quarterly report showed a net profit of $1 per ton in the mill, which is said to have treated 100,000 tons.
Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Direct to Page 1150
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 30.03.2019
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Engineering and Mining Journal. Volume: 92 [XCII], Issue No. 25Info Publication Date:
December 16, 1911Info found on page:
1195Info Title:
Portland Mill Treated Tonnage (But Which Mill is It?) Denver Dec. 9—The Portland mill reports 11,800 tons treated in December{might possible be a typo for November?].
Notes/Text been Edited:
Abstracted from a somewhat longer text.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library: ⊞ Direct to Page 1195
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 30.03.2019
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Mining Magazine. Volume: 6 [VI], Issue No. 1Info Publication Date:
January 1912Info found on page:
32Info Title:
Portland Battle Montain Mill News Much of the low-grade ore is now being treated by mills at the mines, like at the new Portland mill which is taking 12,000 tons of $3 ore.
Notes/Text been Edited:
Abstracted and partly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (January 1912; p32)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 15.05.2021
Type/Category of Info:
Special/Editorial CorrespondenceInfo Source From:
The Mining Magazine. Volume: 6 [VI], Issue No. 3Info Publication Date:
March 1912Info found on page:
191Info Title:
Portland Gold Mining Co. Report About the Victor Mill Several mills treating low-grade ore are in steady operation, the most successful of these being the mill of the Portland Gold Mining Co. at Victor. The results of the operation of this mill are given in the annual report of the company, which has just been made public.
In December 1911, 12,285 tons of ore of a gross value of $35,432, or an average of $2.80 per ton were treated. Of this content $28,533, or 80.5%, was recovered at an operating cost of $1.13 per ton.
During the year the mill also treated 120,961 tons of waste from the former milling operations, having a gross content of $424,490, or $3.51 per ton. On this an average extraction of 81.4% was made.
The net operating profit of the mill for the year was $128,739, or a return of 38% on the cost of construction of the mill, which was $338,581.
The conspicuous success of this mill will encourage the treatment of low-grade ore at Cripple Creek, and the productive life of the district will be correspondingly prolonged.
In December 1911, 12,285 tons of ore of a gross value of $35,432, or an average of $2.80 per ton were treated. Of this content $28,533, or 80.5%, was recovered at an operating cost of $1.13 per ton.During the year the mill also treated 120,961 tons of waste from the former milling operations, having a gross content of $424,490, or $3.51 per ton. On this an average extraction of 81.4% was made.The net operating profit of the mill for the year was $128,739, or a return of 38% on the cost of construction of the mill, which was $338,581. The conspicuous success of this mill will encourage the treatment of low-grade ore at Cripple Creek, and the productive life of the district will be correspondingly prolonged.Notes/Text been Edited:
Abstracted and partly rewritten from source text.Internet Source Text Link(s) {Found/Seen/Known]:
- Internet Archive: ⊞ The Mining Magazine (March 1912; p191)
Above Info was Last Updated on 10.10.2021 (18:51:24)
Above Info was First Seen 15.05.2021
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 10 [X], Issue No. 3Info Publication Date:
March 1912Info found on page:
127Info Title:
Portland Victor Mill Happenings The excellent work done last year at the Victor mill of the Portland Gold Mining Company, is attracting very favorable attention. Not since the successful operation of the Stratton's Independence mill has such progress been made in the treatment of low grade ore. Indeed the feature of the work at Stratton's was the utilization of old dump ore already mined, but at the Portland the chief merit lies in the fact that low grade mine ore extracted in the course of development work and in the mining of high grade ore is being made to pay a good profit.
One feature of the metallurgy still remains undisclosed, viz., the details of the Portland cyanide process which embodies the chemical treatment to which the ore is subjected.
In January, 1911, the mill treated 8052 tons of ore, but the capacity of the plant was increased during the year so that in December, 1911, the total ore treated amounted to 12,285 tons. The gross value of the ore treated during the year was $3.51 per ton, but in December the value of the ore was only $2.80 per ton; but even on this lower grade ore the mill made a recovery of 80.5 per cent at a cost of only $1.1317.
The extraction for year amounted to 81.4 per cent, netting a profit of $128,738.72 on rock which formerly was worthless to the company and thrown on the dump. As the total cost of construction of the mill, as officially announced, was only $338,580.96, it will be seen that the profits from another year's operations combined with those of the year and a half passed, will wipe out the cost of construction; and as there is a sufficient tonnage of low grade ore available to keep the mill running for a number of years to come, the profits will be a very important item to the company.
Among the improvements made at the mill since the beginning of this year, is the installation of a large Portland filter of the revolving drum type. The former equipment filters have the following dimensions: diameter, 12 ft.; face of drum, 9 ft.; capacity, about 45 tons of pulp in 24 hours.
The new large filter is 14 ft. in diameter, with a 12-ft. face, and has a capacity of 90 tons of pulp in 24 hours. In addition to the larger capacity, there are advantages in the deeper submergence of the filter in the pulp, and better opportunity for washing the cake free of cyanide solution and dissolved metals.
Stope filling with mill tailing is another innovation which has been adopted during the past year. This has a double advantage in that it enables the company to take care of its old stopes at less expense than before, and at the same time leaves the surface of the property available for mining work.
One feature of the metallurgy still remains undisclosed, viz., the details of the Portland cyanide process which embodies the chemical treatment to which the ore is subjected. In January, 1911, the mill treated 8052 tons of ore, but the capacity of the plant was increased during the year so that in December, 1911, the total ore treated amounted to 12,285 tons. The gross value of the ore treated during the year was $3.51 per ton, but in December the value of the ore was only $2.80 per ton; but even on this lower grade ore the mill made a recovery of 80.5 per cent at a cost of only $1.1317. The extraction for year amounted to 81.4 per cent, netting a profit of $128,738.72 on rock which formerly was worthless to the company and thrown on the dump. As the total cost of construction of the mill, as officially announced, was only $338,580.96, it will be seen that the profits from another year's operations combined with those of the year and a half passed, will wipe out the cost of construction; and as there is a sufficient tonnage of low grade ore available to keep the mill running for a number of years to come, the profits will be a very important item to the company. Among the improvements made at the mill since the beginning of this year, is the installation of a large Portland filter of the revolving drum type. The former equipment filters have the following dimensions: diameter, 12 ft.; face of drum, 9 ft.; capacity, about 45 tons of pulp in 24 hours. The new large filter is 14 ft. in diameter, with a 12-ft. face, and has a capacity of 90 tons of pulp in 24 hours. In addition to the larger capacity, there are advantages in the deeper submergence of the filter in the pulp, and better opportunity for washing the cake free of cyanide solution and dissolved metals. Stope filling with mill tailing is another innovation which has been adopted during the past year. This has a double advantage in that it enables the company to take care of its old stopes at less expense than before, and at the same time leaves the surface of the property available for mining work.Notes/Text been Edited:
Abstracted from larger textInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 127
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1912 (Volume 10)
Above Info was Last Updated on 08.02.2023 (11:15:47)
Above Info was First Seen 06.02.2023
Type/Category of Info:
ArticleInfo Source From:
Mining Science. Volume: 65 [LXV], Issue No. 1677Info Publication Date:
March 21, 1912Info found on page:
267Info Title:
Portland Battle Mountain Mill HappeningsTHE PORTLAND MILL.
———
It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill. Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain.
The slime tailings are being dumped into Eclipse gulch.
There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill. There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it.
In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore.
The sand tailings are dropped down an 800-foot stope and used for stope filling. The slime tailings are hauled in cars to Eclipse gulch and there dumped. The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.
——— It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill. Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain. The slime tailings are being dumped into Eclipse gulch. There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill. There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it. In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore. The sand tailings are dropped down an 800-foot stope and used for stope filling. The slime tailings are hauled in cars to Eclipse gulch and there dumped. The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 267
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 65; January to June 1912
Above Info was Last Updated on 26.06.2023 (13:14:01)
Above Info was First Seen 26.06.2023
Type/Category of Info:
ArticleInfo Source From:
Mohave County Miner. Volume: 30 [XXX], Issue No. 27Info Publication Date:
March 30, 1912Info found on page:
4Info Title:
Portland Battle Mountain Mill ImprovementsThe Portland Mill.
———
It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill.
Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain.
The slime tailings are being dumped into Eclipse gulch.
There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill.
There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it.
In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore.
The sand tailings are dropped down an 800-foot stope and used for stope filing. The slime tailings are hauled in cars to Eclipse gulch and there dumped.
The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.—Denver Mining Science.
——— It is predicted by Superintendent Thomas Crowe of the Portland mill at Cripple Creek that in March about 14,000 tons will be treated at the Victor mill. Many additions are being made from time to time and new buildings are being erected at the mill, until now it covers the biggest portion of the east slope of Battle mountain. The slime tailings are being dumped into Eclipse gulch. There are 10 agitation tanks in the mill now. Less than a month ago a second tube mill was installed and the sixth Portland filter, made by the Colorado Iron Works, has been put in the mill. There are 31 concentrating tables, an increase of about eight since the first 300-ton unit was installed. A new Dorr thickener has been installed and a house built for it. In two months the mill will be just twice as large as the original plant and will have the capacity for treating twice as much ore. The sand tailings are dropped down an 800-foot stope and used for stope filing. The slime tailings are hauled in cars to Eclipse gulch and there dumped. The Portland metallurgists have successfully solved the problem of stacking the tailings, which has been one of the obstacles in local milling.—Denver Mining Science.Internet Source Text Link(s) {Found/Seen/Known]:
- Library of Congress: ⊞ Mohave County Miner, March 30, 1912, Page 4
Above Info was Last Updated on 30.03.2024 (18:56:19)
Above Info was First Seen 05.09.2011
Type/Category of Info:
General Mining NewsInfo Source From:
Mining Science. Volume: 65 [LXV], Issue No. 1687Info Publication Date:
May 23, 1912Info found on page:
xxxivInfo Title:
Portland Battle Mountain Mill Expected to Make May Record The Portland Gold Mining Co. mill on Battle mountain will make a new high tonnage record in May unless some accident should cause a temporary cessation of ore treatment.
While the capacity of the Battle mountain plant has been classed as of 300 tons, Mill Manager Thomas Crowe is handling between 480 and 500 dry tons daily. The ore treated is of low grade taken out in development from the workings of the No. 2 shaft and reject from the house at this shaft.
While the capacity of the Battle mountain plant has been classed as of 300 tons, Mill Manager Thomas Crowe is handling between 480 and 500 dry tons daily. The ore treated is of low grade taken out in development from the workings of the No. 2 shaft and reject from the house at this shaft.Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ xxxiv (ad34)
- Hathi Trust Digital Library: ⊞ Mining Science; Volume 65; January to June 1912
Above Info was Last Updated on 30.06.2023 (08:45:28)
Above Info was First Seen 15.07.2010
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 11 [XI], Issue No. 3Info Publication Date:
March 1913Info found on page:
123Info Title:
Portland Victor Mill Working Fully The nineteenth annual report of the Portland Gold Mining Company, Cripple Creek district, Colorado, was issued on February 3, and shows the company to be in excellent condition, with greatly improved metallurgical facilities.
The new mill at Victor has continued to demonstrate its success in treating low grade ore which formerly was thrown on the dump as waste. Its capacity has been increased from 12,285 tons treated in December, 1911, to 14,791 tons in December, 1912.
Additions have been made to increase the concentrating capacity, consisting of twelve concentrating tables. Further additions to plant consisted of four Pachuca tanks, one Dorr thickener and two classifiers.
These changes have raised the original capacity of the mill from 300 tons per day to 500 tons. It is expected that the net profits from this mill will be equal to the dividend requirements of the company, leaving the profits from the old mill to be applied toward building up a substantial reserve fund.
The average value per ton of ore treated in the new mill was $3.15, yielding a net profit of $1.17 per ton. The profits earned by this mill in 1911 and 1912 have equaled 90 per cent of its cost, and only a beginning has been made toward the treatment of the vast tonnage of low-grade ore available.
The new mill at Victor has continued to demonstrate its success in treating low grade ore which formerly was thrown on the dump as waste. Its capacity has been increased from 12,285 tons treated in December, 1911, to 14,791 tons in December, 1912. Additions have been made to increase the concentrating capacity, consisting of twelve concentrating tables. Further additions to plant consisted of four Pachuca tanks, one Dorr thickener and two classifiers. These changes have raised the original capacity of the mill from 300 tons per day to 500 tons. It is expected that the net profits from this mill will be equal to the dividend requirements of the company, leaving the profits from the old mill to be applied toward building up a substantial reserve fund. The average value per ton of ore treated in the new mill was $3.15, yielding a net profit of $1.17 per ton. The profits earned by this mill in 1911 and 1912 have equaled 90 per cent of its cost, and only a beginning has been made toward the treatment of the vast tonnage of low-grade ore available.Notes/Text been Edited:
Abstracted from larger textInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 123
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1913 (Volume 11)
Above Info was Last Updated on 08.02.2023 (18:38:23)
Above Info was First Seen 30.05.2010
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 2Info Publication Date:
July 12, 1913Info found on page:
72Info Title:
Portland Mill, Victor/Battle Mtn. Production; June 1913 According to local statistics, the following Cripple Creek mill gold production was:
Name
Tons.
Av. val.
Gross value.
Portland, Cripple Creek
13,600
3.00
30,800
NameTons.Av. val.Gross value.Portland, Cripple Creek13,6003.0030,800
Notes/Text been Edited:
Abstracted and somewhat rewritten slightlyAbove Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 21.10.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 4Info Publication Date:
July 26, 1913Info found on page:
162Info Title:
Portland Mill Expands Its Machinery At the Portland mill, another Chilean mill is being installed driven by a motor, and the transformer station is being enlarged.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 23.10.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 6Info Publication Date:
August 9, 1913Info found on page:
241Info Title:
Portland Mill, Victor/Battle Mtn. Production; July 1913 According to local statistics, the following Cripple Creek mill July output was:
Plant
Tons
Av. val.
Gross value.
Portland (Cripple Creek)
13,600
2.60
35,360
PlantTonsAv. val.Gross value.Portland (Cripple Creek)13,6002.6035,360Notes/Text been Edited:
Abstracted and somewhat rewritten slightlyAbove Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 23.10.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 9Info Publication Date:
August 30, 1913Info found on page:
357Info Title:
Cripple Creek Local Mill Production During July, eight of the local mills, the Portland, Stratton's Independence, Colburn-Ajax, Kavanagh-Jo Dandy, Gaylord-Dante, Rex Mining & Milling Co., Wild Horse, and Isabella plants, treated 35,373 tons of ore with a gross value of $85,428.
This low-grade ore ranged in value from $1.10 to $2.84 per ton, with a general average value of $2.41 per ton.
This low-grade ore ranged in value from $1.10 to $2.84 per ton, with a general average value of $2.41 per ton.Notes/Text been Edited:
Abstracted from a somewhat longer source text talking about several local mills.Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 9Info Publication Date:
August 30, 1913Info found on page:
357Info Title:
Portland Battle Mtn. Mill Addition The tonnage of the Portland Co. local mill will be increased soon by the addition to the Portland Battle Mtn. mill.
Notes/Text been Edited:
Abstracted from a somewhat longer source text talking about several local mills.Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 10Info Publication Date:
September 6, 1913Info found on page:
392Info Title:
Portland Mill, Victor/Battle Mtn. Production; August 1913 According to local statistics, the following Cripple Creek mill August output was:
Plants
Ore treated tons
Av. val. per ton
Gross val.
Portland (Cripple Creek)
15,800
$ 2.50
$ 39,500
PlantsOre treated tonsAv. val. per tonGross val.Portland (Cripple Creek)15,800$ 2.50$ 39,500
Notes/Text been Edited:
Abstracted and somewhat rewritten slightlyAbove Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 11.11.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 13Info Publication Date:
September 27, 1913Info found on page:
509Info Title:
Portland Mill Addition Working The additional Chilean mill is now working at the Portland mill.
Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 14.11.2019
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 11 [XI], Issue No. 10Info Publication Date:
October 1913Info found on page:
571Info Title:
Portland Victor Mill Visit by the American Electrochemical Society In the Cripple Creek district on Saturday September 13 the majority of the party of people attending the 24th general meeting of the American Electrochemical Society visited the new Portland Cyanide Mill in Victor, where Mr. L. W. Lennox, assistant superintendent, conducted the party and explained the steps in the process. Here only low-grade mine and dump ore is treated, having a gross value of not more than $3.25 per ton.
The ore is ground in cyanide solution in Chilean mills, and concentrated on Wilfley tables to remove the sulpho-tellurides which are shipped to the smelter. The remaining pulp is classified into sand and slime, the former being discarded and used for stope filling in the mine.
The slime is thickened and agitated, and finally filtered on a rotary type of continuous vacuum filter. The gold solution is precipitated by zinc dust and collected in filter presses, from which it is removed from time to time, fluxed and melted.
The ore is ground in cyanide solution in Chilean mills, and concentrated on Wilfley tables to remove the sulpho-tellurides which are shipped to the smelter. The remaining pulp is classified into sand and slime, the former being discarded and used for stope filling in the mine. The slime is thickened and agitated, and finally filtered on a rotary type of continuous vacuum filter. The gold solution is precipitated by zinc dust and collected in filter presses, from which it is removed from time to time, fluxed and melted.Notes/Text been Edited:
Abstracted & slightly rewritten from larger text about 'Colorado Meeting of the American Electrochemical Society' p569->591Internet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 571
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1913 (Volume 11)
Above Info was Last Updated on 08.02.2023 (23:11:40)
Above Info was First Seen 30.05.2010
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 15Info Publication Date:
October 11, 1913Info found on page:
589Info Title:
Portland Mill, Victor/Battle Mtn. Production; September 1913 The reported production of the following district mill during September was as follows:
Plants
Tonnage
Av. val.
Gross val.
Portland, Cripple Creek district
14,600
2.96
$ 43,216
PlantsTonnageAv. val.Gross val.Portland, Cripple Creek district14,6002.96$ 43,216Notes/Text been Edited:
Abstracted and somewhat rewritten slightlyAbove Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 18.11.2019
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 107 [CVII], Issue No. 23Info Publication Date:
December 6, 1913Info found on page:
907Info Title:
Portland Mill, Victor/Battle Mtn. Production; November 1913 The Estimated production of the following district mill during November is as follows:
Where treated
Tons
Av. value
Gross value
Portland, Cripple Creek
16,200
$ 2.76
$ 44,712
Where treatedTonsAv. valueGross valuePortland, Cripple Creek16,200$ 2.76$ 44,712
Notes/Text been Edited:
Abstracted and somewhat rewritten slightlyAbove Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 26.01.2020
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 12 [XII], Issue No. 4Info Publication Date:
April 1914Info found on page:
221Info Title:
Portland Mill Tidbit About Concentration The rejection of sand tailing characterizes some present operations in which tagle concentration plays a part. Thus at Cripple Creek, the Portland company first concentrates the ore, removing sulpho-tellurides, and then classifies the remaining pulp into sand and slime, discarding the former.
Notes/Text been Edited:
Abstracted from larger text about 'The Western Metallurgical Field' p221->222, only taking a part linked to Cripple CreekInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 221
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1914 (Volume 12)
Above Info was Last Updated on 09.02.2023 (09:24:15)
Above Info was First Seen 09.02.2023
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 13 [XIII], Issue No. 12Info Publication Date:
October 15, 1915Info found on page:
722Info Title:
Chilean Mills Are Used at the Portland Mill, Cripple Creek Chilean mills are used at the Portland mill, Cripple Creek, for final grinding where a fine product is not required. Six-ft. Akron Chilean mills run at 36 to 41 r.p.m., using 2.5 to 3 tons of solution per ton of ore. Steel consumption per ton of ore ground is 0.797 lb. gross and 0.692 lb. net. Power consumption per ton of ore in coarse-crushing department is 1.86 hp.-hr. and in Chilean mills, 13.26 hp.-hr., or a total of 15.12 hp.-hr.
Following are cost data.
Coarse Crushing, per Ton
Chilean Mills, per Ton.
Total per Ton
Power (at 0.842c. hp.-hr.)
$0.0199
$0.1118
$0.1317
Labor (operation)
0.0318
0.0179
0.0497
Labor (repairs)
0.0103
0.0039
0.0142
Supplies
0.0284
0.0482
0.0765
——————
——————
——————
Total
$0.0904
$0.1818
$0.2722
Following are cost data.Coarse Crushing, per TonChilean Mills, per Ton.Total per TonPower (at 0.842c. hp.-hr.)$0.0199$0.1118$0.1317Labor (operation)0.03180.01790.0497Labor (repairs)0.01030.00390.0142Supplies0.02840.04820.0765——————————————————Total$0.0904 $0.1818 $0.2722Notes/Text been Edited:
Abstracted from larger text about 'Crushing and Grinding' p721->722, only taking a part linked to Cripple CreekInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 722
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1915 (Volume 13)
Above Info was Last Updated on 09.02.2023 (21:06:02)
Above Info was First Seen 09.02.2023
Type/Category of Info:
ArticleInfo Source From:
Metallurgical and Chemical Engineering. Volume: 14 [XIV], Issue No. 8Info Publication Date:
April 15, 1916Info found on page:
415Info Title:
Flotation to Come at Portland Victor Mill The Portland G. M. company has officially announced that its older Victor mill, which was erected several years ago for the cyanidation of low-grade ores, is to be remodeled for flotation, with a capacity of 1000 tons daily.
When these changes are in effect, this one company alone will be treating 2000 tons per day by flotation, using the Callow air-cell in both its Cripple Creek District mills.
When these changes are in effect, this one company alone will be treating 2000 tons per day by flotation, using the Callow air-cell in both its Cripple Creek District mills.Notes/Text been Edited:
Abstracted & slightly rewritten from larger text about 'The Western Metallurgical Field' p415->416, only taking a part linked to Cripple CreekInternet Source Text Link(s) {Found/Seen/Known]:
- Hathi Trust Digital Library; Link to Page: ⊞ 415
- Hathi Trust Digital Library: ⊞ Metallurgical and Chemical Engineering 1916 (Volume 14)
Above Info was Last Updated on 10.02.2023 (09:36:35)
Above Info was First Seen 10.02.2023
Type/Category of Info:
Industrial/Construction NotesInfo Source From:
The Mining and Scientific Press. Volume: 118 [CXVIII], Issue No. 22Info Publication Date:
May 31, 1919Info found on page:
766Info Title:
Portland Victor Mill Tested Cotton-Base Fabric on Concentration Table The E. I. Du Pout de Nemours & Co., in discussing coverings for concentration tables, state that linoleum has generally been used for this purpose, but has not been entirely satisfactory because the cyanide solution used blisters it, thus making its life short.
Recently a new material has been successfully tried, especially in gold recovery. It is a cotton-base fabric having a pyroxylin coating. It is thinner and decidedly more pliable than linoleum, but is as waterproof as rubber.
The Portland mill at Victor, Colorado, has operated one of its tables, covered with this material, continuously for a year without change. It showed no blistering and little deterioration otherwise. The material was designed originally to be used for automobile and furniture upholstering—it is a leather substitute, in fact.
Thomas B. Crow, of the Portland mill, and Luther Lennox, assistant, invite mining and concentrator men interested in this subject to write them for any additional information desired.
Recently a new material has been successfully tried, especially in gold recovery. It is a cotton-base fabric having a pyroxylin coating. It is thinner and decidedly more pliable than linoleum, but is as waterproof as rubber. The Portland mill at Victor, Colorado, has operated one of its tables, covered with this material, continuously for a year without change. It showed no blistering and little deterioration otherwise. The material was designed originally to be used for automobile and furniture upholstering—it is a leather substitute, in fact. Thomas B. Crow, of the Portland mill, and Luther Lennox, assistant, invite mining and concentrator men interested in this subject to write them for any additional information desired.Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 07.03.2020
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 118 [CXVIII], Issue No. 25Info Publication Date:
June 21, 1919Info found on page:
859Info Title:
Portland Mill Schedule Treatment Charges The Portland company has announced a new schedule of treatment charges on low-grade mine and dump ores, as follows:
Up to $3 value, $2.00 per ton
$3.50 at $2.25 per ton
$4 at $2.50 per ton
$4.50 at $2.65 per ton
$5 at $2.75 per ton.
Up to $3 value, $2.00 per ton $3.50 at $2.25 per ton $4 at $2.50 per ton $4.50 at $2.65 per ton $5 at $2.75 per ton.Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 07.03.2020
Type/Category of Info:
General Mining NewsInfo Source From:
The Mining and Scientific Press. Volume: 120 [CXX], Issue No. 10Info Publication Date:
March 6, 1920Info found on page:
349Info Title:
Portland Gold Mining Co. Junks Two Mills Its announced that the Portland Gold Mining Co. has abandoned two of its large mills and that these plants have been sold to junk-dealers, which lends to give one a pessimistic idea regarding the future of the Cripple Creek district.
The 600-ton mill at the mine was abandoned at the time the 1500-ton Independence Mill was completed about two years ago.
The 800-ton plant at Colorado City has also been idle for some time.
Before the abandonment of these mills much of their machinery was placed in the new mill at Victor.
The 600-ton mill at the mine was abandoned at the time the 1500-ton Independence Mill was completed about two years ago.The 800-ton plant at Colorado City has also been idle for some time. Before the abandonment of these mills much of their machinery was placed in the new mill at Victor.
Notes/Text been Edited:
Abstracted and slightly rewritten from source text.Above Info was Last Updated on 30.10.2020 (11:04:30)
Above Info was First Seen 24.02.2020
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