The Pioche weekly record. [volume] (Pioche, Nev.) 1877-1900, 1891-12-31
INSTRUC rIV; FACrS md y !.
URES FROM LAT UATA
a Systematic Description Of TIVE aia-
fng ~fiu .tion Here. The ZerO's de
scripiOn Ore nses,urements, as-
says, Etc.
The Half Moon Group
CONTINUED FROM LAST WEEK.


the second incline and had been driven
W feet at the time of the examination,
the end being in clay shale. Some very
thin stringers have been cut near the
face. The obi ,ct of the tuunel is pre-
sumably to bring out the ore cut ah,ve
it aud between it and the upper incline.
The second incline is lS4 feet deep and
is supp led with small hoisting engine
worked with compressed air from the
Raymond and Ely compressor.
One hundred feet below the collar of
shaft there is a drift 27 feet 5 inches
driven north west. At the intersection
Of the incline and the drift the ore vein
measures 3 feet inches on the south
side and continues to the end of the
drift, narrowing to 2 feet 6 inches and
finally to Is inches at the face. Sampled
for the full length:
No. 4i.--Silver, 22.77 ounces.
HALF MOON GROUP.
These mines are situated 8 miles from
Pioche by road. The country is lime
stone.
Limestone of an average thickness of
q feet always lies above the ore, and
the limestone is capped by shale from
few feet to so feet in thickness. Shale
always underles the ore The ore vein,
which is nearly horizontal, ranging in
thickness from IL inches to Is inches
and occasionally swelling to double this
thickness, is made up of Cerrusite (car-
Donate of lead), Plumbic ochre (protoxide
OF lead). Pyromorphite dead phosphat,),
and galena, the latter frequently in large
masses forming the core of the surround
ing oxides. Oxides OF manganese and
iron are usually found intimately asso,
ciated with the ores of lead. Quartz lie
is the gangue of the ore and is so init.
mately distributed throughout the vein
mas, that sepat alton, except in the
case OF the more massive punches of ore
could only be effected by crushing and
dressing. The average of silica is about
go per cent. With the wide range of
ores, which can be drawn upon for snelt.
ing. particularly the lime ores of Jack
Rabbit, it fortunately happens that the re
Is no immediate necessity for dressing
the Halt Moon ores. With ample water
and the most approved rt~sing machin-
cry it may in the futur, b the part of
wisdom t. inaugurate system OF dress
ing.
The STRAIT. fed structure of ore vein is
very striking and beautiful sight. The
ease and cheapness with which the vein
can be broken down is not the least at
tractive feature of the mine. In the
mining the vein may be treated as seam
OF coal worked on the long wall system,
VIZ, by driving main entry to fixed
limit, if possible on an up grade so that
gravity may help out the loaded car, and
from this permanent entry drive laterals
and rob back, leaving the 'deads" in the
mine. The ore may be undercut by re.
moving the shale. 1t is found that the
ore soon detatches itself if allowed t.
remain for some time after the under
cutting, so that not only is there savine
in explosives, but also in the creation O
fines. The mining claims embraced il
the Half Moon group are:
Il RAINBOW, ISABELLE,
HALE Moon, BRYANT,
l WALL EAGLE, ESSENTIAL.
Entering the Mcmahon tunnel the or
is found at the entrance to the drift, an,
in no place on its length is 1t found to b
, less than IL inches in the roof. Afte
! proceeding about 100 feet there is
, slight faulting, SO that the ore vel
drops and continues falling off at 10,
but regular angle. AT the point vher
I it drops off, the lime rock has been large
: ly replaced by black oxide Of manganes
T measuring p feet in width,
Passing down the main tunuel fror
Y the surface the Jones Drift and Rees
tunnel and slopes from these drifts al
reached, all drifts and slopes being
ore. Owing to faulting the Reese tur
!. mel is IL feet vertical below the N
. Mahon, while the Schwabe tunnel is 2
: feet below the Reese. The faults hay
!. not materially interfered with the mil
ing up to the present, nor has there bee
. any special difficulty in recovering II
lost vein. ss
: Following the Schwabe tunnel, whit
. has general easterly course for 300 fe
. limestone fault is encountered whi'
has southeast course, dipping northes
AS to CO.. This fault has been follow,
% for 300 feet, the drift along it being vel
70 wet, showing that the fault is DRAMA
rs plane.
10 coNTINUEn IN MKT ISSUE