The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1901-12-29

veins, as it requires very little timber
ing. and I do not believe the present
mining cost can ever be reduced.
The main shaft has three COmpart-
ments, one compartment for waste.
tools and men, and two for ore. The
ore is hoisted in skps having a ca
pacity of two and a half tons each.
For the Golden Gate and Backyard
ore there are two loading stations
seventy-seven feet apart. one on the
main tunnel level and one on the Vik-
ing level, each provided with ore pOck-
cts Of about twenty tons capacity. At
the MeTcur mine there are six orc bins.
two of 500 tons combined capacity for
oNidized ore, two of 600 tons for mixed
ore and two Of LOO tons for base ore.
The ore is transported in trainloads
on an electric tTamway to the loading
station at the main shaft, located at
about 263 feet above the main tunnel
level, where there are three ore peck
cts, one of 125 tons capacity for oxi-
died ore, one Of 175 tons capacity for
mixed ore, and one of 200 tons ca
pacity for base ore. The pockets are
conveniently arranged so that both
sl1ips can hoist any one kind or all
three kin IS of ore. TT time required
for hoist g 1000 tons from the present
levels is about twelve hours
Method Of Milling.
"The ore is automatically dumped
from the skips into the crushers. below
which are ore bins having a capacity
Of $500 tons From these bins the
oxiGlzed ore is transported By convey
OTs TO the roll room. where it is
crushed TO Qudrter-inch mesh. thence
it is elevated into the ore bins contain
ing finely crushed ore, which also have
q capacity of about $500 tons; thence
it is transported by cOnveyOrs direct
to d large hopper built Of stone ma
sorry in the first floor above the leach
ing floor. The mixed ore, as it comes
from the coarse crushing storage bins
Is screened through revolving. screens,
the coarse being picked up by belt con-
veyCrs and going through the same
treatment as that described above for
oEidized ore, while the finely crushed
ore. which contains 80 per cent Of the
talcy material found i'm the mixed ore.
drops from the screens into automatic
reTerberatOry roasterS. where it is cal
cined, automatically cooled. and then
transported. as previously described.
to the hopper. The base ore as it
comes from the coarse storage bins is
carried over the caIcining department
on belt cOnvey0rs to the roll room.
where it is crushed to one ighth-inch
mesh, thence 1T is elevated into the
bins containing the finely crushed ore.
From these bins it is transported by
belt cOnVeyOrs 10 automatic reverber-
atory r0aster.. where it fs7 roasted and
automatically cooled and transported
to the hopper. From the hopper all of
the ore is trammed by hand to the
Tanks. whore il is le2ched with cyan
ide solution. After being leached, the
ore is dropped through doors in the
bottom of the tanks into cars and is
trammed by hand to the taiiings
dumps. The solution which has leached
the gold out of the ore is piped from
the teaching tanks to the pTecipitating
tanks. where the gold is precipitated
by zinc dust The zinc dust carrying
the gold is then collected by filter
presses and trammed to the refinery.
where the gold is refined, and from
which it is shipped as bullion to the
United States mint at New York.
Unusual ingenuity and mechanical
skill have been displayed in planning
and building this mill and the ore is
handled in the most economical man
ner possible. One man on each shift
distributes all OF the ore in the mill.
and from the time it is dumped from
the sBips into the crushers il is han
died entirely 10y gravity and automatic
machinery until it is trammed to the
lsaching tanks.
At the present time. as an expert
ment- the ore is being handled on the
following plan The Oxidized and
mixed ores are not kept separate, but
are put through the mill together as
mixed ore. The convenience of this
plan is patent to anyone, as it provides
Tor classifying the ore into only two
Kinds instead of three. If the mixed
ore is kept free of base ore I think
this plan viii prove 10 be a good and
economical one.
The ore reserves in the several mines
belonging TO the company are esti-
mated at 1,lll320 tons. and this esti-
mated al a net value of Sos should
yield S2,32f0G0 available for dividends.
Dir GemmeH estimated the mining
of the company at I.250.-
01o tons additional, and says as to the
mining possibilities:
There are in addition possibilities of
developing good bodies of ore from a
large area in which little or no pros
pecting has been done. There are
about 407 acres belonging to this com
pany situated in the most strongly
zone of this district. OF
this territory only about ninety-fve /
acres have been developed or mined. /
leaving Sl2 acres to be prospected.'' /
The report concludes with a presenta- +
ton Of the following points;
First-Large bodies of pay ore are
loa in sight, between them there is