The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1906-11-30

concentrating ore of the Morris. Brooks
and Bunker Hill workings.
| think that without any question
the Alpha vein has been the source of
copper in the porphyry; that, as is
clearly shown in the lcachcd-vcin
filing, it was originally sulphidc ore
~ n quartz gangue, that it was
robbed of its values by descending
waters, which passed, TO a great extent,
at least into the porphyry, and there
deposited copper with silica. The
Alpha vein reached the water level at
a depth of 1905 feet. All this point 1t
was still in the IRON gossan, The ore
developed In the GirouX shaft is some
what different from that of tho
porphyry ore at the eastern end of the
property, 1t contains less silica, aud
has a heavy iron content. carrying cop
per and iron sulphides and oxides of
copper. The copper content Will
range from 3 to per cent. The
ground has not been measured up, but
there arc many thousand tons OF this
ore.
Concentration Necessary.
The ores in the Morris. Brooks and
Bunker Hill shafts contain less iron,
and the copper occurs in the form of
chalcOcite. These ores are highly
sllicious, and VIII have to be concen-
trated before smelling. The material
is soft and easily mined, and can be
readily concentrated in the ratio of
ton of concentrate. The Morris ores
also carry gold ranging from 81 per
ton To 50 per ton, the gold content in
creasing as the Alpha vein is APP
preached. The Norris and Brooks
shafts will soon reach the 300-foot
level, and drifts will be run in the ore
body AT this depth in the same manner
as at the 2oo-foot level. In the pres
ent workings the pay ore has an
average width of about I40 feet On
the surface the ore body is about 600
feet in width, and is barren because
Of its oxidation. Below the leached
zone, at a depth Of from sixty to
100 feet, the valuable ore is en-
countered, widening out like an in.
verted wedge. At the 200foot level
as stated, it has n width of about 40
feet; and in the crosscut seems to ex-
tend out further as depth is gained.
We have now reached the point
where the construction of a milling
plant is necessity, and ! recommend
that we proceed with the construction
OF a concentrating plant having an
ultimate capacity of 1000 tons per day.
The treatment OF 500 tons of ore per
with an approximate saving of cOncen-
trates per day of an estimated
value of 80 per cent in copper and
S o in gold per ton, Making the proper
allowance for fuel and fuxcs. the
present smelter would accommodate
about 40 tons Of crude ore, in addi-
tion TO the forty tons Of concentrates,
which, after allowing for losses in
would show a yield of about
$4,000 of copper per day.
Taking into consideration the grade
OF the concentrates and the economy
with which the ores can be smelted, in
connection with the concentrates. [
do not think the cost of production will
exceed 10 cents per pound of copper
produced. II is entirely practicable TO
bring the water from Steptoe valley.
nine miles distant. to the mine, and per.
haps more economical than to haul
ore to the Steptoe valley for treat
ment. In the Steptoe valley, Mt an
elevation of less than 1900 feet below
the elevation of the mines. we have
purchased 1900 acres of land. which
Will furnish an ample supply of water.