The Pioche weekly record. [volume] (Pioche, Nev.) 1877-1900, 1891-11-12
!i!cHs mining REPORT.
Instructive FACTS AND Fi6-
URES fHOM LATE DATA.
4 systema Description of the MIN
ing Siiu ttiOn Here. The YubR's de-
seriptiOn. Ore Measurements, as
says Etc. The Three Veins.
coN1INuEp FRoM LASH WEEK.

CONTINUED FROM LAST WEEK.
In carrying out the investigation of
this and the other mines embraced in
this report, as exhausting a system OF
measuring and sampling was adopted as
the tine and means at disposal would
permit. 1t is not claimed that the sam
pling of mine, and the determination
of its metallic contents by assays, can
give much more than an approximate
roti'a 3 its present OK ps,sl,active value,
''Ore in sight" is an unfortunate ex-
preston which has come to be freely
used, and to the layman conveys an al
together mistaken idea, for however
large an ore body il, all that is, in
sight " is the surface of the body where
ever exposed. I" Estimated reserves >
is the better expression, and reserves can
only be estimated with any claim to
accuracy when four sides of the ore body
are exposed, and when the drifts or
wines are not very far apart AS 1t
rarely happens that four sides of an ore
body, or Chimney" can be seen, the
trend of such bodies must be care.
fully noted, and liberal allowances for
pinches, faults, and barren ground be
made. The taking Of small or hand
samples must be avoided as far possible,
for differentiation is as liable to be
made as well as generalization. When
ever the locality will permit, a large
canvas should be placed where all the
/, ore can be caught which may be broken
down, and the sample should represent
, the ore as it would be sent to the re-
duction works. In other words, the
: entire exposure on its length, breadth,
and height should be broken down.
To this end two men should be employ
ed to relieve each other, and the samples
should be as large as circumstances and
. the facilities for crushing will permit.
; AS large sacks as can be conveniently
= handled should b, used, several being
4 employed for one sample. When pos
f. sible the sampling should bo suppl
q mented lby the records of ore actual )
mined and reduced. 1t fortunately hap
pens that had the hearty cooperation
j, of every one connected with this and th
n other mines examined by me.
To avoid unnecessary repetition, TIL
levels are always spoken of by thei
v number; the measures are given by fee
# and inches. Lead is always given il
in percentage, and when ounces of gold o
i. silver are given, Troy ounces in tn
10 ayoirdupois ton of 1000 pounds ar
Ia ment.
or An instrumental survey of the mine
II was not made. The courses of levels c
- veins were taken with htnd compsa'
90 and the measurements w-re close euoug
nd for determining the le' 9Th cf level
4 crosscuts, ond ore bodies.
ct The Yuba lode is made up Of thr'
"a distinctly defined veins, which are 1
r.. spectively named in the order of depos
cd ton of the south or hanging side of Il
"a. lode: South Contact Vein, Middle Wi
70 North Contact Vein.
- At the | 200 level the cross.cut sho,
h. the follows measurements:
90 Width of South Contact, 4 feet /
on tween quartz and porphyry.
.be South Contact to Middle Vein, 80 fe
ou in porphyry.
rlv Width of Middle Vein in porphyl
nd 7 feet.
hit Middle Vein to North Contact, 7 f,
MT in po:phyry.
s,s Width of North Contact, fo,
,lls Total width of lode at this depth,
to feet; of which SO feet is in porphyry,
md Guiding the Middle Vein filling.
tho S00.FooT LEVEL.
tbo At this level the incline cuts into
"a porphyry of the Middle Vein, which
Salt this point does not cary over 2 t
ORC ounces of silver in stringers of quartz
nod the hanging wall Immediately eas'
=, = the incline cross cut has been dri,
= 10 II feet to the North Contact vein an
the feet beyond into the quartz foot.w
,ave The bedded quartzyte, as seen in
le6. extension of the cross.cut, lies at
h holo angle of 2l', which is about its aver
o,a angle in the district. The cross Gu
;obt entirely in porphyry. The vein mea
did es feet 5 inches, and at two points
met an angle of S5'and Sl.5'. Where
lred cross.cut intersects the vein, the porE
his ry hanging wall is well defined and ,
> me- smooth, and while the quartzyte wa
col not as smooth, it is nevertheless
l;clv marked.
the North Contact West. AT the Yves
,n,o, the cross. cut on the vein there are
d It inches of ore extending to a cave frc
small upraise This is the extent of
development to the west.
,yery North Contact, East From
cross.cut feet east there is an up
known as "West Uprase )'ll fee
Vir. length and 40 feet high in low grad,
'elry. ranging from 2O.25 ounces. Going
Co.'s 10 feet A inches the porpbyry has