Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1907-01-02
In His Report to Manager Walter
C. 0rem Mining Engineer Tells
About Big Tonnage.
ONE or GREAT COPPER MINES
or This Country-Sees Annual Profits
OF Over S2,50O,O00 on Treatment
OF I 900 Tons Daily.

srtNuuO. y. L. jennings, WHO III tVc All
Inspection of this attractive YerIustcn
mine about two weeks ago placed his
report ia the hands of Manager Nelter
G. Cor, } yG.tetday aft irnoons and Jul,
ing from, Wat he saws in that docu-
ment it is destined TO become
one of the most widely known copper
propositions in this country.
Mr. Jennings figures that there are
l0,OOO,OOO tons of ore in the Nevada
Douglas that win average 3is per cent
copper and treating 1000. tons per
day, on the basis of 20-cent market
he sees an annual net profit of $780,
coo, which is more than 30 per cent of
the company's capitalization. The cost
he says, should not exceed S15 cents per
pound. The engineer gives a detailed
description of the mine and its ore
bodies. calling attention to the large
deposits Of high grade ore. For the OK
ide ores, Mr.. Jennings recommends
treatment by some teaching process, tor
the medium grade garnetiterous ores,
the magnetic process similar to the
one recently tried out at the BluestOne
mine IN the same district and the blast
furnace for the final treatment of the
concentrate and smelling ore. The fol-
lowing extracts are taken from the re-
port Of Mr.. Jennings:
OWNS LARGE GROUP.
"The 20 claims owned by the Nevada
Douglas Copper Mining company con-
tain i0,000000 tons OF ore, with an ay-
erage copper content of 3la per cent.
BY building a railroad approximately
20 miles long to connect the mines with
the Southern Pacific system, at Wahus-
ka, at cost not to exceed $4,000:
the erection Of concentrating plant
with a capacity of 600 tons per day, at
a cost of $T50,000, and a smelter of 500
tons daily capacity, at a cost of 100000
an annual output of 100000 pounds ~
copper can be produced at a cost in
New York of Sla cents a pound, or an
annual profit of $2.760000, when copper
siselling at 20 cents.
THE following detailed description OF
the mines. ore reserves and conditions
arc given. on which my conclusions are
based: The property Of the company
comprises 20 mineral locations. 10 OF
which are being patented and 10 held By
title under locations. These mineral
lcca tons, together with land with
water rights in Smith valley comprise
about 600 acres, the mining locations
belng in one group located on the west
slope of the Mason valley mountains
AZ an average elevation of 500 feet
above sea level.
THE ORE BODIES.
THE deposits of the Yerington dis
trict are classed as contact .metamor-
phic ore deposits by economic geolo-
gists, and may be described as masses
of metamorphosed and mineralized
limestone resting upon an intrusive
granite having furnished the necessaTy,
heat and heated mineralized solutions
required to convert the adjacent lime
stone into massive garnetiferous rock
impregnated with copper ore. In addi-
ton to these areas of garnet-copper
rock. the same Undertaking. solutions
have filed fault assures with copper
ore consequently, the district contains
both great bodies of garnet-copper rock
resting on the granite and copper-filled
assures in the marble!zed limestone
SUI -ounding the sarnetrock.
The ore bodies occur IN and are linz
tied by the extent Of the garnet zone,
hence IL becomes necessary to deter
mine its area and thickness, From sur
veys made by the companys engineer
the area of the outcrop of copper-gar-
net rock on the Francis. Douglas
Lookout and Sunlight claims amounts
TO ls00 600 square feet a tunnel which
with its branches and cross-cuts, Is 700
feet In length, has been driven in the
garnet rock on the Douglas claim and
is 80 feet below the apex of the hill; a
wlnze has been sunk so feet below the
tunnel level. all on the copper garnet
rock; this gives nj this point a knowf
thickness of 40 feet for the garnet for
nation. The granite which underlies
the garnet, outcrops goo feet south of
the Douglas tunnel and 100 feet verti-
cally below IT, this would indicate that