Tonopah daily bonanza. [volume] (Tonopah, Nev.) 1906-1929, 1911-04-21
shaft sinking, core drilling

-
shaft sinking, core drilling
and extra excavations 80. 4.3S0I
These costs, taken per dry ton
Of ore shipped to the mill, are 1.94
cents lower as to direct costs, aud
21S cents lower as to total costs,
excluding extraordinary Develop
ment, than for the previous year.
Development work during the
year from the Mizpah shaft failed
| to find any extension of the Mizpah
vein system along its strike or dip.
A number Of small blocks of ore
have been left to support the walls.
| These blocks will have to remain
for an indefinite period to insure
safety in the mine workings. Iso-
lated blocks remain to be taken
out, but they form very small pro
portion of the ore already extract
ed.
Further development work by in
termediate levels may result in fiud-
ing more ore than now exposed in
the Mizpah fault vein.
Small detached veins were discov-
cred in the vicinity of the Mizpall
shaft during the year, but theil
commercial value is small.
:, The Burro veins were developed
further during the year with favor.
able results. This work has ad LED
considerable tonnage to our ore
reserve
Development work from the Sill
yer Top shaft on the Valley View
, vein shows small extensions Of The
vein, but its boundaries in all di
) rections are practically determined
intermediate levels and raises are
, probably the only further develop
ment needed
Under and to the south Of th'
+ Valley View vein, veins designated
, as Valley View footwall veins, Nos
i year These veins will furnish
. considerable amount OF ore.
q In the eastern parts of the Silve
: Top workings, veins parallel to an
v south of the Silver Top veins hav
4 been found by crosscutting.
n A small amount of work wa
done during the year on the Desc.
!. Queen vein on the 540-foot level c
the Silver Top shaft. More wor
al in connection with this vein II
q mains to be done at greater deptl
> Development work from the Re
Is Plume shaft for the year sho "
Il favorable results. Considerable MOI
"a work remains to be done in col
N nection with the main Red Plum
vein. Development work on tn
a vein shows the ore to lie in shoe
n and that the shoots are separate
= by barren stretches of vein materia
" The north Red Plume vein WI
m developed further during the ye
10 with equally favorable results.
e. Development work at the Sar
of Grass shaft has been stopped in @
der to get further information
rv diamond drilling, which is now b
he ing prosecuted, before attempting
IT. crosscut
Development work at depth
,e, the 1500-foot level of the Mizpi
to shaft consisted in extending the W
ur tical diamond drill hole No. fro
or 653 to 1916 feet and in sendi
s. hole No. 10 down 224 feet at
or steep angle to the south, The
10, holes all showed Tonopah rhyol
IRE Qower rhyolite), a barren form
an tion, and have been stopped.
mt The estimated value of the {
M reserves on February 1st, 1911,
ng $6,605, ,97S (goHd at $2O.67, silv
9TH at so centsl.
The estimated tonnage of ore
the serves on February 1st, 1911,
354,94 tons and includes assur
probable and possible unbroken Q
l54 ore broken in slopes. ore on dun
and stored at Millers, the estima
1913 average value of which is SIS
per ton.
Continued OH page y