Willmar tribune. [volume] (Willmar, Minn.) 1895-1931, 1919-06-04
development
0FzzPORPHYRY
Mine TO Be
-...-.
GIVEN IMPETUS
Recent Developments of Property
Dispel Doubt Felt of Extension of
Disseminated Ore Bodies Beyond
Big Mine Boundaries. ~~ =

The falibility of human judgment has probably
never been more strkingly illustrated than in the
history of the development of copper mining in
the Globe Miami district.
In 1879 and 1880 when silver mining was on the
decline, and the "cream had been skinned" there
were many who believed that the end Of mining
in the Globe district in sight And in later
years. after copper mining had developed into the
leading industry of this district and Globe was
known as one Of the great copper camps of the
west, the pesslmist was still the job. That
there was mo ore below the 9Th level of the Old
Dominion mine," and that grass would be seen
within year, growing in the streets of Globe"
were predictions made by socalled copper ex-
perts at different times, yet the Old Dominion
Is bigger and better mine today than ever be-
fore and no one now living has the prescience to
Tx the date of its exhaustion.
Who is there that imagined twenty years ago
that the low grade ores in the Miami section could
be worked at profit; or that more than 10000
900 tons of commercial would be developed
by the Inspiration Consolidated and Miami Cop
per companies?
HAS DISSEMINATED ORE BODY
Any doubt entertained of the extension of the
disseminated ore bodies beyond the boundry lines
of the Inspiration Consolidated and Miami COM
panies has been dispelled by the development in
the properties of the Porphyry and Barney Copper
companies, soon to be consolidated under the
name of the Porphyry Consolidated Copper COM
pany, which adjoin on the west and south the Live
OAK, the richest mine of the Inspiration Consoli-
dated company
The Porphyry has been partially developed by
shaft to the depth of us feet and by levels at
$50 and $50 feet. In sinking the shaft passed
through 80 feet of commercial ore averaging about
IL per cent copper, and also considerable low
grade ore. The shaft is bottomed in ore carrying
chalcocte, bornite and chalcopyrite The princi-
pie ore developments are the 650level The
crosscut on that level penetrated orebody dag
onally zoo feet, the actual thickness of the ore
being about 80 feet, of average commercial grade
INDICATES GREAT oRERoDY
Inc west drift from this crosscut at $50 feet
encountered leachedout vein which continues
Tor about $50 feet in width, deeply stained with
iron ana wn1cn was at one time, no doubt, filled
with copper and was through chemical action,
leached out and deposited in the form of chalco-
cite at lower depths The management attaches
great Importance to this leached formation beev.
ing that 1t strongly indicates the presence of a
large body of chalcocte and primary ore below
the oxidized Along this level chamber
Is being cut preparatory to sinking a winze which
IS expected to penetrate high grade orebody
that is disclosed in the drift about 40 feet to the
southeast.
This drift is being continued west and has abont
$50 feet to go to reach Barney drill hole No. 1
In which ore was penetrated at the depth of 500
feet. Two Of three samples taken from this drill
mole ran Ia per cent copper, and the third
drill hole an raise will be started for the purpose
OF developing the ore located by the drill The
principal development work planned for the i'm
mediate future is continuation of the drift north
westerly from the Wlnze, and main drift toward
the drill hole Later the management proposes
TO resume sinking the shaft and will probably
continue it to the depth of 900 of 10000 feet
Inc information here given obtained by a
representative OF the Record who, in company of
Manager j. B. Coplen and Mine Foreman W. E.
Carter, inspected the workings at the 65Ofoot
leVel-Ar1zona Record, Globe Arizona.
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