El Paso herald. (El Paso, Tex.) 1901-1931, 1910-06-20
MINING AND OIL NEWS.
OIL OIL
COPPER PORPHYRY MINE AND NEW 3OO
TON MILL LOCATED NEAR FL PAsO.
A Big Development Scheme
Locates Large Body of
Rich Ore. B

| per company, at Bent, Il. NJ, Is lilies
| up in the Sacramento mountains from
Tularosa, on the Southwestern railway,
and 80 miles from FL Paso, are and
/ have been for the past five years UNI
/ dergoing an elaborate scheme for de-
velOpment- For the purpose of testing
| the actual copper contents of the ore,
/ a mill with a nominal capacity of 80
tons per day was installed four years
! ago. with the result that out of
about $500 tons of ore milled, with
! out an efficient mill euipment
Z21,230 pounds of copper has actually
been extracted, or a saving of 1917
and at the same time only a loss in
treatment running from OF to 1.3 was
sustained. so that the gross contents
of the as mined averages betW cen
2.017 and 20 copper.
The ore body lies close to the surface,
and consists of one of the fine grained
porphyries, OVERLAND by sedimentaries
and altered sedimentary rocks. consist
ing of limestones, shales and sand
stone. the latter at and near its con-
tact with the underlying ore having
been metamorphised or altered by heat
TO a quartZite- Immediately below the
Quartzite a layer of highly cupriferous
scnist is found for a thickness of from
one to six feet. This schist carries some
oxides and carbonates of copper, but
its main value lies in the chalcocite or
copper glance. Below the layer of
schist a body of pOrphyry lies COM
paratively flat. and dipping about %
degrees, with an average determined
thickness of over A feet.
This sheet or sill of porphyry has
been more or less fractured and brec-
ciated by intrusive dykes of black |
diorite. and in the cracks caused by |
these intrusions we find redeposition !
of the copper sulphides, associated with |
quartz crystals. lime carbonates and |
heavy spar, barium sulphate. Some of !
trese cracks have a width of from a |
mere streak up to Il inches, and when |
over couple of inches in width this !
high grade ore does not have to be /
milled, but can be sacked up directly in !
the mine for shipment, as the average /
copper contents of this sorted ore was {
found to be over 40 percent, and a few /
shipments ran as high as so per-
cent copper This high grade material |
Is all included in the average percen- |
tage of the whole mass.
Large Body of Proven Ore.
Drilling operations have been carried !
on during the past year with a cyclone
core drill and small churn drill Of the
same type, and these drill holes, of
which there are II, running all the way
- ACNb III ucplH TO 004 Ie6I, and
at distances Of from 30 feet to 1900
feet from the old workings. have def
nltely proved that, in spite of certain
stretches OF comparatively barren dyke
the ore bearing porphyry is
practically continuous over a very large |
area Having demonstrated this fact.
Lhe company IS now systematically drill
ng the ground at distances of 100 and |
zoo feet At the same time underground
re haf-
oId workings, which are only so feet
leep from the collar of the shaft. to
he drill holes, thus practically provins
~ actually breaking the ground the
average tenor, thickness and value of |
he ore body.
Having -conclusively proved that II
1as commercial ore body the COM
'any enlarged its plant, and has also
the ditch which Is over 10000
Get long with capacity of $50 cubic
eet per minute.
The 500 Ton MEaI.
The present mill. which is on the eve
II completion, will have a crushing
,apacity Of from 240 to 300 tons per
lay. and viii have all modern ma
hinery- The fines from the bins and the
rushed material from the crusher will
'e fed to 16 inch conveyor, which will |
$50 serve as a picking or sorting belt |
MS NOiA NCy VI VIII QSllNor the ore to q |
ct Of Gates rolls and after passing s
hese rolls the entire crushed pro- 5
uct will be elevated to the top of {
he mill building where it will be au- {
omatically sampled through a set of
amplers.
A new store, warehouse and general I
administrative building 100 feet by As
aet at one end 80 feet at the other has
cen completed in which Is located the
office. private office sam
ling and assay department besides the
rafting room. T
Taking everything into consideration [
ne Tularosa Copper company at Bent
remarkably situated. being ND in the +
at an altitude Of nearly
300 feet which insures a pleasant ell
ate The property embraces 500 odd |
cres Of land, including within its linn =
about 100 acres of cultivated ranch
nd, laid out to alfalfa, an excellent a
opIe orchard and other small fruits. all
nder fence, and last but not least a
nail river. the Tularosa which not :.
MY furnishes free water power. but
tcelIent trout fishing, that the tired =
lner, can relax his limbs by whipping =
lie stream and thus follow in the steps :,
the immortal Isaac Walton.
APTNT MIME nrSrDSCr