The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1908-12-27

per cent copper ore in the ground ex-
posed is doubtless conservative, and
only represents a small part of the ore
which will be fully developed by sys-
tematic development. There is also ap-
proXimately 5000 tons of ore on the
dumps that will average per cent.
THE tonnage of the surface ore, as
mentioned above, cannot be given even
as an approximate, but will without
doubt amount to many hundred thou
sand tons, of a grade that will ulti-
mately make ii workable ore.
THE property is in a condition for
continued mining of $50 tons of ore a
day for long period, and tonnage Is
being added every day in numerous
places on the property"
On the Map.
1t is a well known piece or property
and of so much Importance that IL is
marked on the map of Nevada as the
Douglas mine" Years ago, when cop
per was extremely low in price for
mer owners of the Douglas marketed
about $4,000 of a grade ore ranging
from 80 to 40 per cent copper to the ton.
While on the dumps and stored IN
sacks are thousands Upon thousands
Of tons Of ore which will average bet
ter than 10 per cent, the old workings
of the property are showing up i'm
mense bodies of the metal which will
assay all the way from per cent up
into the fancy figures.
Puzzlins Formation.
1t is difficult to explain the geology
of the large masses of ore in Douglas
mountain, but it is best described
as deposit of carbonate, sulphide and
oxide, showing no distinct lines of de-
narration. Each character of ore
changes within a few inches. The gen
eral formation is garnetfferous lime,
blue lime and a massive white lime. the
ore occurrences making in assures cut
ting through the garnetiferous lime;
the ore-bearing zone extending, gen.
orally, from one fissure to the other,
/ interlacing. The character of the ore
| apparently has not changed from the
surface.
In the slopes can be seen large
masses of what is locally termed spot
ore. which is dissimilar to the general
character of the ore of Douglas noun
tain. In appearance it resembles gran
lite, and is often mistaken for this rock
unless closely observed. The gangue
is gray, the mineral being a black OK
ide of copper. So far as is known, the
spot" ore exists only in Douglas
mountain. 1t carries from IS to % per
cent copper to the ton.
Four Different Outcrops.
There are four different characters of
outcrop on the Nevada-Douglas. First,
a hard and compact rock impregnated
with carbonates; second, a soft light
colored limonite with varied-colored
chalcedony scattered over the surface
and fourth, a typical gossan Outcrop.
There are no obstacles whatever in
the metallurgy of Nevada-Douglas ores
according to the tests which have been
recently made. Such ores as carry 6
per cent and more OF copper also carry
an excess of iron and are self huxing,
or almost so.
During the year the only ore which
has been marketed by the company has
been the tonnage which has been en-
countered in the regular course of de-
velopment. 1t was only the ore which
had to be moved so as to not retard
the progress of the development work
which was shipped.
The mine has an enviable record of
producing to its credit, and it is in line
with the systematic campaign which