This list are from pages 16, 18 & 24 in the December 31, 1899 edition of the Morning Times newspaper, and this is what that list start off with claiming:
Big words from this newspaper, but the list seem to go on forever with names so who knows, they might have had right in their statement back then. 
Following is a partial list of the mines which produced shipping ore in the year of 1899, and within the coming year this paper did expect half as many more already known to be added to the list.
In addition, the end of the article published in the newspaper giving this list, mention the following;
Added to the above list there are a large number of leases not mention, which are producing, and which must be looked upon as individual shippers, where ore is being sent out, and there must be taken into consideration that there are a vast number of small mines, the owners of which work then sporadically during the year, and some of them have been overlooked, not intentionally, but through failure to find the owners on the ground after repeated visits to the same.
Where all of these mentioned, the list would be twice as long as the one here presented for the readers attention.:
A.(top)
Portland company
B.(top)
Battle Mountain Consolidated company
Portland company
Portland company
Work company
C.(top)
Portland company
Lexington company
Little Puck company
Boston-Colorado Consolidated company
Anchoria-Leland company
Bull Hill and Straub Mountain company
El Dorado Gold Mining company
D.(top)
5 shafts
Ophir company
Portland company
2 shafts
Enterprise company
Portland company
E.(top)
Gold King company
Anaconda company
F.(top)
Pinnacle company
Portland company
G.(top)
Work company
Woods Investment company
Tornado company
H.(top)
Matoa company
Ajax company
Bull Hill and Straub Mountain company
Buckeye company
Portland company
Temonj company
I.(top)
Arrows company
7 shafts
J.(top)
Gould company
Republic company
4 shafts
K.(top)
Boston Colorado Consolidated company
L.(top)
Golden Cycle company
Princess Alice company
3 shafts
Work company
Gold Coin company
Big Four Gold Mining company
Portland company
M.(top)
Ingham company
Work company
Enterprise company
N.(top)
Elizabeth Cooper company
O.(top)
Creede & Cripple Creek company
4 shafts - El Paso company
Union company
P.(top)
Union company
Golden Cycle company
Work company
Q.(top)
R.(top)
2 shafts
Republic company
S.(top)
Portland company
Tornado company
Raven company
Papoose company
Little Puck company
Bradford and Cripple Creek company
T.(top)
Elkton company
Portland company
Battle Mountain company
U.(top)
V.(top)
Calhoun company
8 shafts
W.(top)
Buckhorn company
Woods Investment company
Portland company
10 shafts
X.(top)
Y.(top)
Z.(top)