, 1892-04-02
SILVER CROWN ORES.
Official Report of the Tests Made
on Them In Denver.
In Some Respects the Showing is
Very Satisfactory.
Advantages Which Would Accrue
From Roasting Works Here.

The report of VIM. E. Mead Of Omaha
on the Silver Crown ores which were re-
duced in Denver was submitted to the
board OF trade yesterday. II will be of
much interest to miners and those inter-
ested in mines. The closing paragraphs
are peculiarly interesting as showing the
necessity for roasting works in Cheyenne
as a factor in the mineral development Of
the state. The report in full follows:
Report on Silver Crown Ores.
To the Cheyenne Board Of Trade
have to report to your honorable o that
[ have completed the test on silver Grown
ores begun Feb. 25 with one exception.
an analytical test sent to Deadwood, B.
D.. for special treatment.
In making this report l would say that
the mode OF handling ores hiss changed
very materially in the last few years, and
many of the refractory low grade ores
heretofore worthless have been brought
into the market by means of concentra-
ton, through which process the refractory
gangue is eliminated, and every day this
is being done more economically until
now it is only a question of motive power
that decides the profit in any plant estab-
lished.
The very exhaustive exhibit OF concen-
trate before you Is a testimonial OF the
improvements made in tables for this
work within the last few years. while tor
a display of clean separation and saving
the shines 1t can not be excelled.
In regard to the conditions of the hills
in which these mineral deposits are found,
l find the district has been badly shaken
up and the hills moved around in all d.
r~ections; of course above this disturbance
the hills are more or less opened up by
assures through which the elements have
been to work upon the mineral, changing
its nature aud in some cases dissipating
the values, while in other parts Of the
camp the deposits have been made by
volcanic action. while the cap rock carries
only scale metal verY hard to save.
My first test was a perfect illustration
Of this cap rock above the true mine and
was ore from the Copper King, resulting
as follows:
Sample No. O, stock assays. gold, $40
ounce; silver, 2 ! 10 ounces; copper, 3 10
of l per cent. Samples No. |. 2 and 3.
graded concentrates twenty-eight tons
into one, assay gold. 5 $40 ounces; silver,
l6 2-10 ounces: copper 9 per cent. show
ing a large loss in concentrating, the
water taking 1t up in solution. This ore
shows the metal in a thin scale as per
specimen shown.
In the lower level, below the cap rock
in this same mine. the ore shows no scale
but a clear crystalized pyrite, a perfect,
cube and the specimen shown is part of
the stock which assayed: Gold. ! 10
ounce; silver, 297 ounces; copper. 1885
per cent, while this same pyrite crops
out under the cap rock on the west end Of
the hill, showing an ore that makes a
clean concentrate five to six into one and
carries so cents to Sl.40 per ton In surface
rock, with AZ per cent iron and only 2 per
cent silica which IS very close separation.
This is a very large deposit of low grade
ore promising a fair return for working,
and Welding a product that will sell in
any market.
One hundred pounds of the cap rock
ore from this mine has been sent to Dead
wood for treatment aud Is still out. | ex-
psct to be able to save a good per cent of
the values finally in this ore.
The other tests are No. s stock, No. 9
concentrates of the Morgan mine next ad-
joining Copper King on the south and
carries from 80 cents to Sc per ton in gold
concentrates SIX to eight into one but
loses much of the value IN concentration
No. 10 stock, No. IL concentrates u
of M. T. Beubam's mine, the Hog Back
lode. the concentrates carry 80 cents in
gold are ten INTO one and must be surface
ore.
No. ~ stock, Nc. Is concentrates; from
Lone Star lode too near the surface to
yield well. carries $l.60 in gold ITO
ounces in silver.
No. IA stock and No. Is concentrates
from Comstock lode, tested at the Boston
Il Colorado smelter, assays IL ounces
gold, 6 ounces silver. rs. 80 per cent cop
per.
The two last mentioned properties be-
long to VIM. Barnard and associates.
No. l6 is Irish Jim lode, very low in
oolJ. An oant