The Anaconda standard. [volume] (Anaconda, Mont.) 1889-1970, 1895-05-10


what aluminous. OF about 2 feet. and
per ton; below this a band OF clayey
material OF about IS per ton down to a
trace Of gold.
For the most part this regularity r.
disturbed with a corresponding unequal
distribution OF the gold ore In large
and small deposits.
The miners follow the ore In these
changes. which. on working. often
chambers out into large. Irregular
rooms. 10 to Is feet high. In some cases
IL seems as II by the porphyry f1ow.
where II had broken up the structure
and pushed II forward out of place.
a dam had been formed on the lower
side. which partially stayed the subse-
quent flow OF the gold solution. and
II had penetrated farther into the sur
rounding rock, and also left richer de-
posits. ~
Across the gulch. in another mine
this kind is said to have furnished
$4,000 worth of ore. The room was
about ~ to Is feet wide. 30 feet long.
by 10 to - feet high. In all the assays
there was so little silver that 1t was
added for inquartation.
The mining Is easy, and In working
the soft places, which are in the larger
part OF the rooms. one man can knock
down and handle 10 tons a day. In
the narrower work much limestons is
encountered. requiring drill and dyna-
mite.
The milling plant. nearly two miles
down the valley. is built for the cya-
hide process.
"A crusher delivers the ore to a mod
fhed Gillian mill, from which 1t II ele-
waited to a storage bin, and spouted
from this to a car, which runs on an
overhead track and dumps into the
teaching tanks.
This Gillian mill has a false bed of
perforated cast iron plates through
which the ground material falls. 1t
leaves part of the material too coarse
and with far too much shines. The
company intends replacing 1t with
set of double rolls and cylindrical
screens, which will give a more uni
form product and less fines. and render
the teaching part more satisfactory.
The teaching tanks of wood, nine in
number, are about IL feet diameter and
two and one-half feet inside depth.
with the usual false bottom covered
with burlap for altering. Each tank
holds about 10 tons of ore, with
present capacity of 80 tons a day for
the nine tanks. There are. besides the
necessary tanks for making and stor-
age of stock solution, and tank for
weak solution. One force pump con-
meets the system together.
the solution OF cyanide or potassium
used is one-fifth of 1 per cent. and the
extraction for the month of January
last on a trial run was about 65 to rs
per cent for the first two weeks, with
an average ore run into the tanks of
s12 to SIG per ton. The last two weeks
of the month there was an improve
ment, the last week showing an cx-
traction of 81 to nearly 80 per cent, and
the ore ranged about $40 to $12 per ton
as run into the tanks.
THE zinc boxes are about Is feet
long, with the standard size divisions,
two 15-foot boxes coupled endways by
a pipe. In the January run only five
divisions of one ore box were filled
with zinc shavings, and this was found
sufficient with close attention, but as
they became a little fouled with dirty
solution they were taken out, washed
and put back again.
For reduction of the precipitates
sulphuric acid was freely used, the re-
sulting product chlorinated, and the
gold precipitated with ferrous sulphate.
There is an abundance of coal In the
country around the mountains, and II
reaches to where Ii almost laps over
the gold deposit on the foot of the
slopes 1t is evident that these noun
tains have been elevated by pushing
through the coal formation, and as the
mountain rose the coal formation has
been eroded."