The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1907-01-02
BIC PROFITS IN
THIS COPPER MINE
Nevada Douglas Can Earn Fifty
Per Cent Of Its Capitaliza-
tiOn Yearly.
E. P. JENNINGS HAS
FILED DETAILED REPORT
YeringtOn Property of utahns
Is One Discovery of Past
Season.

That the numerous Salt Lake stock
holders in the Nevada Douglas company
have one of the great discoveries OF the
past year In this Yerington proposition
is becoming more apparent each day. ana
Salt Lake generally is coming 10 rea.iSe
gineer, has just returned from ferlns-
ton and the Nevada Douglas properly.
and in report to the latter company
regarding their possessions. fairly opens
their eyes as TO the possibilities OF TINS
copper producer. Mr.. Jennings estimates
the tonnage of the Nevada Douglas AZ
10 900. 600 tons. this figure being arrived
at after deducting very generously from
what he gives as the probable tonnage.
Ten million tons OF ore is an amount
hardly appreciated by the general run OF
folks, but should the company succeed
In the future In handlins 1000 tons day,
counting 400 working days in the year.
Il would take over thirty years TO nam
die this great amount OF copper rock
Mr.. Jennings gives some extremely m
,eresting figures In his report regarding
the probable earnings OF the Nevada
Douglas. Taking the daily capacity at
1000 tons Of 3; per cent copper ore, after
deducting all expense, tie annual profit
OF the company will he 81, ,1S0.o 600. or more
than 30 per cent Of the companys Capi-
taIization. In part, the report is as fol-
lows.
The twenty-nine claims owned by the
Nevada Douglas Copper Mining company
contain 1n.000,0e0 tons Of ore, win an
average copper content of q per cent.
Rv building railroad approximately
twenty miles long 10 connect the mines
with the Southern Pacific system. At wa
huska. at cot not TO exceed Sl,o.puu'
the erection of a concentrating plant With
a capacity OF 1000 tons per day. at cost
OF $3.50 000 and Il smelter of 300 tons
daily capacity, NJ a cost Of $500. 900. an
annual output of % 600 900 pounds Of COP
per can he produced al cost in New
York of 81 cents q pound. OF an annual
profit of s2,76o.oOO. when copper is selling
Al 20 cents.
''Thc following detailed description of
the mines. ore reserves and conditions
arc given. on which my conclusions are
based: The property of the company COM
prlses twenty-nine mineral locations. ten
OF which are being patented and nine
teen held by title under locations. These
mineral locations. together with land with
water rights in Smith valley, comprise
about 500 acres. the mining locations be
ing In one group located on the west slope
OF the Mason Valley mountains. at an
averase elevation Of 5000 feet above sea
level.
Description OF Ore Bodies.
"rhc deposits OF the Yerineton district
are classed as contact metamorphlc ore
deposits by economic gcoogists, and may
be described masses OF metamoTphosed
and mineralized limestone resting upon
an intrusive granite, the granite having
furnished the necessary heat and heated
rnineralized solutions required TO convert
the adjacent limestone into a massive
earnetferous rock impregnated with cop
ore. In 3Gglllpu 10 llltSt dl'dS VI
garnet-copper rock. the same mineraliz-
ing solutions have hlled fault assures
with copper ore; consequently. the dls-
tricl contains both great bodies OF gar
net copper rock resting on the granite
and copper-fl filled assures in the marble
ized limestone surrounding the garnet
rock.
'"rhe oycbodics occur in and are limit
ed by the extent OF the garnet zone.
hence II becomes necessary TO deter
mine It's area and thickness. From sur
the area of the outcrop OF copper -sarnS
rock on the Francis, Douglas. Lookout
and Sunlight claims amounts 10 l.8oV 0po
square feet. \ tunnel. which with It's
branches and cross-Cuts. Is 700 feet In
length, has been driven In the garnet
rock the Douglas claim and is 90 feet
below the apex Of the hill: winze mas
been sunk so feet below the tunnel level.
all on the copper garnet rock; this gives
At this point a known thickness of 10
feet for the garnet formation. The gran
tie which underlies the garnet. outcrops
1900 feet south OF the Douglas tunnel and
400 feet vertically below II; this would
indicate that II the surface Of the gran
tie was horizontal the garnet zone would
be approximately 400 feet thick, but We
have no means of determining the dip
Of the granite. therefore this evidence is
of small value, more than TO Indicate
that The zone is very thick; possibly over
200 feet However. we can safely as
sumo an average thickness OF 100 feet;
This, multiplied into the superficial area
OF l.sOU.VNU square IecA ana lHs leSull
divided by 10, the number OF cubic feet
in one ton OF ore, we will have 100000
tons of garnet copper rock. a thickness
OF 200 feet gives SO, 900. 900 tons. Making
due allowance for areas Of rock that are
not mineralized sufficiently for profitable
extraction, IL Is, In my opinion. safe Il
place the available ore at 10000. 00e tons
THE original ore IN the garnet zone is
q granular aggregate OF chalcopyrite, and
garnet The rock for a depth OF from
10 10 feet has been partly leached and
the remaining copper Ia combined Will
carbonlc acid or silica forming the min.
erals, nalachite. azuriIe and chrysocols
Below this zone is an indefinitely defined
zone of enrichment, which carries botf
oxidized ores and enriched sulphides. bu
harder bands OF the unaltered garnet ore
pass upward through the enrichment zone
nearly 70 the surface. Ore Of a higher
grade than the average Garnet-cop
rock occurs in broad zones that proba bl,
represent crushed bands OF the origina
limestone which offered more open chan
nels for the mineralizing solutions, On'