Arizona republican. [volume] (Phoenix, Ariz.) 1890-1930, 1908-10-12

southerly slopes of the ranges in the
vicinity of the famous Planet and
Signal mines, and again to the
westward in the neighborhoOd of
Bouse, where a number of excellent
prospects are now being opened up
in the limestones and schists. The
erosion in this section has been very
pronounced, as is evinced by the
broad valley at SalOme and Butler
valley. both filled to great depths
| by detritus from the present rough
mountains. which, i'm its downward
course to the then untitled valleys,
ground off and carried away the sed-
| imentaries except upon the ridges,
where they remain today as the fin
gers Of a gigantic hand, uniticg in
| the low foothills and under the
gravel wash of the valley. From
Salome Peak westward for about six
miles to Granite Point, the overly
| ing schists and limestOnes are very
much in evidence, and again at the
westerly end of the range. at and IN
/ the vicinity of the Ironwood & Ari-
IONA property.
The most striking feature of the
Ha-cuvar mountains. even at a great
distance, is the remarkable and I'M
usually regular series of dark basis
bikes which cut the main granite
range almost at right angles l can
not better describe them than TO
quote the well-known geOlogist, FitZ-
James Mccarthy, who, upon first
seeing the Harcuvar range and these
cross bikes, said: TT is beribboned
with bikes like the skirt of a white
dress trimmed with ribbons of black
velt." These Gikes are from a few
feet up to nearly a hundred feet in
width, and many of them are miles
! in length, cutting the sedimentarv
foothills as well as the main granite
range, and undoubtedly had a pre-
dominating influence upon the depo-
sitiOn of the ores, particularly the
| chara cteristic sulphide copper ores
carrying gold and silver values, as
these ores In the Harcuvar range are
always associated with the dark basic
dikes. While these bikes are corr
monty termed diOrite, they have the
character and appearance of a very
dark diabase. and 1 think will be
found to be diabase upon determine
ton. In any event they have a close
relation to the known ore bodies,
which is for the moment of more in
terest TO the prOspectOr and miner
than whether they be diOritic or dia-
basic to the petrologist In addi
ton to the dark cross bikes cutting
the granite and the sedimentariea,
great masses. sheets and sills OF light
cOlored granite porphyry have been
in-ruded into and between the schists
anu limestOnes, generally following
the qualification but often tayng
the appearance of bikes cutting
across the formation. The 3chists
and limestones show great contact
netamorphism in the neighbOrhoOd
CT these granite intrusions, serIciti-
cation of the schists being very no
ticeable, while large outcrops Of cpl
dote, garnet. hcmatite and magnetic
are plentiful.
Theoretically. certain conditions Gre
necessary 10 the existence of large
ore bodies, and in all the large cop
per districts OF Arizona and the
southwest certain conditions ere
known to exis. and the association
and effect Of particular formations
With lofcrelca to the ore bodies has
b. 81; tar; ought studied out. Vntil
today, given certain known cOnCi-
tions in any district, one can intelli-
gently plan development and general
ly predict the outcome to a large err
tent. 1t IS these particularly favor
able conditions for ore deposition
that mining men in Arizona are look
ing for today, and the building Of
the new Arizona & California rail-
road has opened up a section re-
Dlete with y nTeIIuI mineral posi-
bilities
In the goat Narcuvar mo IIt.,ih
limestone bet. octtu known A. re
Salome schist belt, theoretically the
geological conditions are all in favor
of large ore deposits-and what is
better than all theory, the existence
of ore bodies has lately been proven
in nearly a score of places. in the
schists and on the contact of the
dark cross bikes, as well as in the
limestones, and now that high grade
sulphide copper ore carrying good
gold and silver values has been
opened up in the limestOnes in the
vicinity of Tank Pass, the future of
the district seems bright, especially
as there were no other surface in
dications than the formation and
some iron stain, which favorable
conditions exist in numerous places
throughout the district. The sui
phide ore now being opened up is
chalcopyrite in a blue silicious lime
stone gangue. averaging four to five
percent copper, six to seven dollars
gold and three to four ounces silver
per ton and is an ideal concentrat-
ing ore, rough pan concentrates from
the dump assaying from $225 TO
$245 per ton.
The favorable geological conditions
are all here; the GRANTEES. the over
lying sedimetnaries, schists and lime
stones at least up to and including
the close of the carbOniferous era
and probably much later under the
detritus running out into the valley,
the dark basis cross bikes so numer-
Gus, and lastly the intrusions of light
colored granite pOrphyry. The nu-
merous contact veins of high grade
copper ores carrying gold and silver
values now being opened up along
these cross bikes. even in the main
granite range and at intervals for
a distance of over six miles, is am
pie evidence that these bikes were
accompanied by strong mineral So
buttons and that the area of mineral