The Bozeman weekly chronicle. (Bozeman, Mont.) 1883-1889, 1888-09-26

| iHSN "'i it'i'' iiINif W punt
out some method or process through
which these minerals will yield tIeir
values at Il profit. That is the all I'M
portant question. For number of
years past some method to protitaby
treat these base" ores, or more proper.
ly, auriferous snlphides have attracted
! the attention Of meiallurgists and prac-
tical mill men. should also mention
in this connection class of ores which
carry flour" and float" and 'rllstv"
gold, also gold in association with tel
lurium. A great many different meth
ods were desired, and as the demand
was yearly increasing, by reason Of the
rapid exhaustion of the free or sur.
face ores, human ingenuity was taxed to
the utmost, to meet this great and even
increasing want. Whole camps were de.
serted in consequence of the inability
OF the known systems of reduction, to
extract the values contained in the ores
at profit. Great loss was entailed, run
ming into the millions, in consequence of
these failures.
Owing to the comparative exhaustion
of the placers and the stoppage of hy-
draulic mining in California, as also the
great decrease in the production of gold
quartz lodges, our yearly mint reports
show great falling off in the yield of
this noble metal. Mining men of ex-
| al l,, e., Al,
in measure, the gold of the future pro-
| duction must come from the auriferous
sulphides. The first practical result to
solve this problem of treatment was
chlorination and teaching This metal
ingical-chemical process, was intricate
and expensive, requiring, TO operate sue
cessfullv, the services of good metallin-
G,st, well up i'll the theory and practice of
his profession. Snch persons are scarce,
the demand being largely in excess of
the present supply. Various other pro-
cesses were invented, all possessing some
merit, but failing in general way to
meet the requirements. This great want
demanded a system that ordinary mill
men and miners could learn to operate
successfully and that would recover at
comparative small cost high per cent of
the sample assay of the ores above re-
ferred to.
As before remarked, nature seems to
have pointed out the first step in the
right direction. to successfully treat these
dry auriierous sulphidr ores tbv dry
is meant ores free from lead and zlnc)
namely oxidization. The gold obtained
in the stamp mill and aras'ra was from
free quartz, and oxidized ores The yield
AS a rule, was i'll proportion to the per-
fection of the oxidization, and the alb
sence of -four, float and rusty gold, that
would not analgama in the battery, or
stick to the plates. We conclude for the
reasons given above, that perfect and
cheap oxdization will go long ways
towards realizing the desired result. The
next step wonld seem to be to collect in
some expeditive aud economical manner
the gold set free by oxidization. With
piul'Si III tilt way VI Cutdp
crushing. driving and pulyerizing: assum-
We can claim 10 have placed in practical
operation method that will fully meet
the great want mentioned.
This brings me again to more lengthy
and careful consideration of the Walker
Carter mill as regards its applicability to
the class and grade of ores just discussed.
This plant has been almost continuous
operation at this place, since about the
10th of last July, treating on all average
about seven tons of ore in ten hours rum
ming time. desire 10 state that every
facility has been afforded me to fully in
vestigate its merits, and that have tried
to avail myself of the privilege to the
fullest extent. Not one test but, a great
many have been made, al.ays showing
and proving the claims of the parties in
charge to be verified. have in former
letters attempted to describe in brief
way the mechanical appliances in use, to
carry out what il called the Walker-Car-
ter proress. l will repeat again that the
machinery is all new to me. but while
being new is certainly most etficacious
and fully meets the demands made upon
it. The commencementSf the operation
of treating ores at this mill Is crusher,
called the Gates No. l Combined Fine
and Coarse cru sher, and is probably the
only one of the kind in use in this terri
tory. l have used the Blake & Dodge
crushers, ard while l must say they are
good machines, they are far inferior to
this Gates crusher, both in quantity and
quality of work done, wear and tear and
power required. This crusher will break
the rock into pieces from one eighth o
} an inch to one inch thick, making some
pulp; its capacity At one-eighth of al
inch, is two tons per hour and at one inch
, six tons per hour. 1t is splendiC
r crusher to sample after, set 70 one-eightl
: Of an inch. The crushed ore is dis
, Charged into two drying cylinders, unde
, which a hot fire is maintained, t.
: tn oroughly dry the ore, before the sam,
8 is pulvrrlzed The dryer revolves at tn
f rate of one revolution per minute, takin
e about thirty minutes for the ore to pas
through. The driver discharges on
h cooling floor, from which the ore
y raised by all elevator to hopper tha
$ supplies the pu'verizer This machin
h is called trisbee-Lucup dry pulverize
d 1t makes 800 revolutions per minute an
If requires fourteen horst power to drive i
3 1t occupies space of four feet by iiS
s. feet. The feed is averaged autnniatirall
y and can be very CLOSELY adjusted. HAY
o taken great interest in this machine
d fully satisfy myself. AS to its capacit
ct and wear and tear, | unhesitating
a assert that two of these machines. SO Il
Is ranged, that one can relieve the other
case of breakage; will produce one It
sc of sixty mesh pulp every hour of the
&c and keep it up day in and day out, we,
lie in and week out. They will easily
lie the work of % stamps, dry stampir