Arizona republican., 1917-02-18

What c. II. James, English engineer, says of
the Pioneer district in his report the Magma
Superior Copper Company:
"The ore-b bodies and shoots of the Superior dis
trict both north and south contact veins
between limestone, quartzite and other sednen-
tary beds, and in associated with cross issure
veins traversely cutting these sedmentaries and
continuing downward into the underlying diabase
containing diorite, quartz porphyry and other
later intrusves.
"The latter series of veins constitutes the
principal incentive for deep prospecting and deve
opment.
the development of the contact veins until the deep
bonanza ore bodies located in the east and-
west fssure series.
AS TO FIssUREs
"A series of assures cut the mineral belt,
usually at right angles, at intervals for several
miles along its and have produced a number
of up-iifs and down throw blocks Where these
faults have been extensive subsequent erosion has
produced deep canyons, such being particularly
marked in the break through the Magma proper
ty, the Queen Greek break just north of the Magma
Superior property, and the nteroper break in the
latter. All three of these show deep seated
ments and offer the assumption of heavy mineral
ization below with Abnormal teaching action
the surface, would agree with surface indica-
tons in all three
THE Magma fault plane has produced bonan-
metal mine at depth the Queen Creek fault
the Magma Copper Company's al. S. & A." group
SHOWS great encouragement Tor deep exploration
and the third main break" with which the inter
oper vein is closely connected, offers similarly
attractive field for exploration.
THE presence of intrusions and masses of
qusrtz- porphyry in and near the mneralized fault
veins evidently bears directly deposition,
great part Of the Magma Gre consisting of soft
quartz porphyry vein filling highly mineraIized
with ehalcocite and chacopyrte, though quartz
porphyry need not be essential to heavy ore
deposition along the metal carrying fssures.
NATURALIZATION
manganese and iroh oxides are prevalent in
and below the outcrops of both contact and fissure
veins, and the high degree of these forms of min
eraIization in the Magma fissure vein oucrops and
shallow workings is duplicated in the nteroper
cross vein of the Magma Superior.
The Magma ore from the deeper levels consists
mainly of naturalization Of chaicocite. chaco-
pyrite and pyrite, ard appropriations and small
strngers Of pyrte showing at the present
water level ESQ ft) in the Interloper shaft and
accompanied by soft quartzose, porphyritic vein
filling, it is reasonable presumption that an ore
shoot is rot far off. 3
THE iNTERLoPER VEIN
The interloper vein of Magma Superior Cop
per Company is the most attractive showing on
the property possibly because work has been
done it and il is better exposed by erosion of
the sedimentares.
The vein becomes more defined and shows
heavier naturalization in depth and includes sui
phides Of iron and little copper suiphde below
the tIU II. level. A sort porphyritic vein-fInq
coming in at above the present water level and this
may be regarded promising feature.
CONCLUSIONS
"A careful study Of the surface conditions in
the Magma Superior Copper Company's property,
together with comparison of those which at sur
face directed tha way to the successful opening up
of the Magma mine, indicate strong probability
that highly profitable ore bodies will be found in
the proposed development of the Magma Superior
Company's holdings.
"The property provides very worthy, prospect
ing and development project and warrants the
belief that commercial ore in quantities will result
from development of the present shcwngs and
that the depth necessary to find commercial ore
will probably not be more than four five hundred
feet.
The deep exploration and development of the
property is strongly recommended by the writer as
an undertaking of high order, promising very
satisfactory results"