The Goldfield news and weekly tribune. [volume] (Goldfield, Nev.) 1911-1947, 1916-06-17
CIRCLE Mining District
HAS Mines OF GREAT PROMISE

A description Of the Gold Circle
mining district. outlining its geol-
ogy and setting fourth the princi-
pal developments in the mines, has
been issued by the secretary of the
chamber of commerce of Midas, the
central town of the district. The
report follows:
The Gold Circle mining district
is situated on the southeastern slope
of the Owyhee bluffs at the head of
of Elko county. 1t is reached by
stage from Battle Mountain CAS-
miles,, Golconda CAS- miles,, both
on the Southern Pacific railway, and
from Red House CSC miles) on the
Western Pacific.
. Wages for e%ight-hour day are 81
for miners, $3.50 for shaft work,
and IS for mill-men
Water for domestic purposes is
available from numerous springs
throughout the district. Midas, the
supply point of the district, has its
W water system.
Water for mining and milling
purposes can be had from at least
three creeks in the districts. OF
these Summit creek has a known
flow. in the dryest seasons, of 80
inches.
Geology and Formation
According to William Emmons GU.
S. G. S., the rocks of the district
consist of rhyolite flows and flow
breccias, cut by andesite bikes and
overlain here and there by ande-
site flows.
The veins of the district lie
roughly parallel, striking northwest
and dipping to the east-north-east.
They are characterized by an almost
vertical position. Development to
date indicates that most of the de-
posite are replacement products
along sheeted zones in the rhyolite
or at the contact of rhyolie and an
pcsits are replacement products
dLlplC VI thC ldJCI CldoS. Ill tllS
property the vein is located in a
fault between the rhyolite and the
later andesite. The vein matter con-
sists of crushed, silicified rhyolite,
heavily iron-stained and cut by
quartz stringers.
The type vein of the district con-
sists of from two to ten inches of
quartz and silicified rhyolite, usu-
ally rather broken at the surface but
becoming more solid as depth is
gained.
Emmons says in the report be-
fore referred to: "The primary ore
is auriferous pyrite and quartz,
with which are associated a silver
bearing sulphide and other minerals.
AS the surface is worn away such
ore is oxidized and the sulphur, to-
gether with most of the silica and
iron and some of the gold, is CARR
ed away, but a larger proportion of
the gold remains. AS a result Of
this process there is likely to be a
concentration of the gold in the up
pei pdlt Vi Tic uSpOSll, uuC W WudL
extent such concentration has taken
Mace in this district is not known"
This was in 1908. Since then the
development of the Elko Prince
mine has proved Emmons' theory
correct. Secondary enrichment has
made this property the present big
producer of the district.
There are four mills in the dis
trict at present, three stamp mills,
none of which is operating at this
time, and the new Mercy ball-mill
of the Elko Prince, a fifty-ton
plant which has been in operation
since last November.
The ElkO Prince.
The Elko Prince vein is an alter
ed rhyolite and near the surface the
vein matter is an irO~n-stained sill
Gifted rhyolite. but with depth it be-
comes a quartz filling of a we'll de-
fined fissure, varying in width from
two inches to two feet. Second
airy enrichment has played it's part
here to an extent not yet revealed
in any of the other mines of the
camp. In 1910 this property had
attained a depth of n hundred
feet in it's deepest shaft. The values