The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1911-07-25
F F|NE SHAPE Of
MIAMI PROPERTY
Perfectly Equipped Mine Is De-
scribed in the Walker
Copper Letter.
SAVING AT PLANT
VERY GRATIFYING
Cost of Previous Development
Is Charged Against the
Present Operators.

THE Miami Is on OF the most thorough
~ and perfectly equipped mining proper
ties I have ever seen. knowledge OF the
position extent and value OF It's ore
body In advance made this possible. NO
expense was spared to provide LABOR
saving mechanical devices for the rapid
continuous and economical handling OF
It's ore. Its concentrator Is magnifi-
cent structure. says the Walker Copper
letter
When Miamrs concentrator Is opeTat-
ing TO It's full capacity and treating
1000 tons OF ore, only twenty-five men
pnrtments, from the crushers at the Iop
to the concentrators at the bottom, ms
will be equivalent TO 12o tons daily per
man. Tho Miami ore body is the thickesSt
and most compact one in the district II
is about 1850 feet long. 500 ieet VICE ~
the broadcast point. and has an extreme
depth OF 45C feet; In one place Tneoa II ep"1s is
about 900 tons OF ore on the dump,
which was extracted from Development
openings.
Shaft Safely Located.
The main working or hoistlng SHAFT
is located 500 feet from the rim OF the
can never be affected by tho caving OF
the Gaping About $4,000 feet, nearly
eighteen miles. of underground deveioP.
he"o the ore, ' As the ore is mined it is dropped
into bins Just above deep WORKING
level. From these bins II drops, ar ps,octrIo INTO
locomotives and hoisted In skips II rs
understood that tho shaft has capacity
to hoist 10000 tons daily The ore IS
the concentrator, classified-the coarse
and fne separated-the coarse material
ground In powerful mills and the whole
passed over tables, which concentrate
and save the copper bearing mineral.
Only small portion OF the ore is srouho
second time, l.,
Miamls present mining cost is apous
s1.32 but to this 10 cents is being added
| to cover previous development expense.
The top and peaks Of the ore BODY are
being mined by square setting. II being
evenly and gradually settle down as the
ore is broken and drawn away below.
Either the top slicing or the shrinkage
stoping method OF mining Will probably
he used If by the former method, II
will cost about s1.2b, and by the latter
around rs TO So cents ton: Both metn !, ,
ods Will be tested thoroughly, and II II
lis proved. as believe it Will be. that the
ore can be kept as clear OF capping ano
as large n percentage extracted pE
shrinkage Stopping II dd wla SAY Saye amouni mlal
to It's ultimate profits.
Recovery Is Good.
AT present Miami is operating three
sections OF It's concentrator and treating
about 1900 tons of ore daily. Just no"
concentration may be costing 10 cents
ton. but IL has been pretty well demon
strated that It will not be over % cent;
when the whole plant is In operation anc
treating 5000 tons daily: The recovery
lis about 75 per cent of the values In tnt
ore and this probably VIII be raised t'
The ore is splendidly adapted to con.
centration, and so is the concentrate
to the ore. About twenty-five tons WI
be concentrated into one. and the con
centrator. which now averages about Al
per cent copper. Will be raised 70 40 pc
cent and perhaps higher by eliminatint
more of the silica. BY cutting down th'
silica In the concentrates very i'm
portant economy is effected Miami 4
making an unusually eleen coaeentrat'
now. but possibly 100 to loo pounds NOR
silica may be removed from each ton
II so it Will further reduce the cost o
its copper about one-eighth Of a cent
pound.