Eureka daily sentinel. [volume] (Eureka, Nev.) 1871-1887, 1878-06-13
GEOLOGY OF SECRET CANYON.
A List of Some Eich Mines Ia that
locality.

Communicated
Eprrog 2~ENrfxEL: The geological fea-
lures Of Secret Canyon Mining District. as
noted, are heavy uplifts and disturbances
through the s~edimentary formations. these
arc included under ~t-isssic %jurassic and
cretaco0us limestones and shales. Ex-
posures of metainorphic and volcanic rocks
are seen cropping out along the
summit of the mountain ridges. The
greater part Of the district Is covered with
sedimentary rocks, having e well inclined
eastern dip. The eruptiye rocks are por-
phyritic traciyte, pushed through creta-
ceous layers Of saale. The Hoosac Noun
tain and its spur are the eastern portion.
Prospect Mountain continuing south, and
its spurs tending west, make up the geo
graphical features Of the district. The
surface Of the district has bocr. shaped by
glacial action, which has left the record Of
its history in characters that are not easily
obliteratcd by atmosphcrical or other in
luences. The polished, grooved or striated
rocks and crratic boulders denote the cx-
istence OF moving ice. Beside. other indi-
cations of glacial action can be observed.
j llt ca1lfDIb are tut dDN{ lliO tl4t fiHIi
metamorphic quarizitc, slowly worn by the
swift currents OF streams carrying large
quantities Of water, issuing from the gla-
ciers. In the canyons are found deposited
the metamorphic and volcanic material
brought down by the moving ice. The
quartzites occupying the summit and
sides Of the ridges rave undergone
a change by metamorphism. Be
ing hard and dense aud not subject to
d~isinie4ration by the atmosphere, they
retain the polish and striation of the NOV
ing ice. The metallic field is four miles
east and west and from five to six miles
north and south, and contains aboGt %
good prospects that viii pay well for de-
veloping and viii yet be Of great impor-
lance to Eureka county. Ten Of these To-
cations are patented. The Geddes d Ber-
trand, the first in productiyeness, is stu
atcd on a continuance OF Prospect mount
ain. A large ore body has been found re-
Gently. It's dimensions are unknown, hat
as the work progresses tie bonanza gets
more extensive. 1t was met with on the
lower level, 300 feet from the surface, and
as far as explorations nave gone is found
to be over 50 feet in length, Is feet in
width, and as it dips next under the shale
at an angle Of 10 degrees, the probabilities
are that further west it may raise to the
surface. Tie gangue or matrix is quartz
encased in ~silicate Of lime. The strike of
the lode is a little west Of north. Before
Prospect mountain ross from tine neither
sea OF fire an ocean of water rolled over its
sides. The rocks that encase the ores Of
the Geddes Il Bartrand mine being sedi-
mentary-the deposit Of a ~triassie sea-
there is naturally much water to be found
.,.,,.oaAoI x.t4l a., 49, At.4 lo-~ 154uxr-.
the footwall and the ore body. The mine
is under the management Of that indie
fatigable foreman, Richard Bergman.
There is ore coming out Of Bertrand No. /
that works $i16 10. The lessees are Bill
Gibbons and Charley Chambers. Tie ore
as il out of the mine averages $500.
The Peasant mine, formerly known as
the Scorpion, is situated IN one Of the
spurs OF the Hoosae mountain, and is
opened by shaft No. / and an incline 31feet
in depth. The ore out Of this shaft worked
$780,. One Hundred tons were extracted IN
all from shaft No. 2, working over 500 per
ton. and 25 tons Of the same character was
hqlsted out Of shaft No. 3. Three tons of
ore were taken out Of shaft No. 4, ayerag-
ing 81 800 per tom. About 200 tons were
taken from other parts Of the mine that
worked about $i00 per ten. The ore aud
matrix are encased in fcidspatic porphyrv.
The width Of the lode is 70 feet. The work
ings dip east southeast, and the strike il
about north northwest. The Herbert mine
is a continuation Of the Peasant. Its crop
pings are very large, and mark the shape
% = butte, 800 feet above the plane of the
canyon. and about $50 feet in length. Il il
capped with porphyry and ore stained near
~ all its length. The workings are two
shafts, and a tnnnel 100 feet in length,
Shaft No. | is on the north side Of the
butte, so feet in depth, and has a eross-cui
20 feet in length, out 81 which 40 tons OF
ore has been extracted. Shaft No.
2 is So feet deep, and eight tons
Of rich ore has been taken out.
Many tons was and is being extracted from
other parts of the mine, the same in char
acter as in the shafts. These mines are
the property of John Herbert, an Old pio-
neer Of this place. The General White
mine is situated Immediately south of and
is a continuation OF the famous Page 4
Corwia mine. Work is being resumed
and it bids fair to rival its neighbor. II
was located in 1870 by Doc Hamilton and
Bill White, and is opened by two shafts.
No. l incline is 100 feet in depth. and sew
eral tons Of ore have been extracted, the
general average of which was $3.50 per ton,
although some Of 1t went into the thou
sands. The ore is a rich chloride of a free
milling nature. Shaft No. 2 is 40 feet in
depth and contains vein matter from top to
bottom. The location embraces sos feet,
and dips west under a belt Of shale that
runs south from the Dunderberg. There
are other mines whose ores are immeas-
uTabiy richer thaa my in the Eureka
Mtaaf..o nsp4r,o4 eF .-l;11 -. 80. .