The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1920-01-22

non ana manganese oxides in which
are ciuStS y. quartz and cerusite
crystals Practically all the ore be-
.hs mined al the time of visit was OBJ
l1lhed from the yO0~foot level and
from an intermediate level ~ feet be-
10" the 9OO-toot level. ON the 800
root level the ore shoot is 400 feet
long and from to 10 feet wide, with
an average width of = feet, The vein,
OF that part of it which constitutes
the lead ore shoot, is oXidized to a
remarkable extent. Much of it is a
llSht and porous mass of iron and
manganese oxides in which is d net
work OF thin crusts of quartz and fine
~ divided cerusite. Against the foot
wall are GENERALLY masses of pure
galena, many of them l foot or more
IN diameter, coated with beautiful
ceruslte crystals. In breaking open
apparently solid masses of galena lit
tie nests of carbonate crystals were
round. Masslcott, malachite, and
/ pyromorphite also occur in the oXidiz-
ed ore. West of the point where the
croSscut intersects the vein the fis-
sure is occupied by lenses and irregu-
lar masses of quartz sporadically min
erallzed with galena, pyrite and sparse
chalcopyrite and tetrahedrite. The
vein west of the crosscut is narrow
and is not oxidized
On the 1100-foot level the crosscut
from the shaft to the main vein is 200
feet long. A smaller vein was cut
about rs feet from the shaft, and
drifts have been run on it to the east
and west for 500 feet. The small vein
is parallel to the larger one in strike
but dips so degrees s. 1t is from s
inches to feet wide. West from the
crosscut ore occurs probably in COM
mercial quantity for a distance of 100
feet. 1t consists of punches of galena,
pyrte, chalcopyrite and tetrahedrite in
gangue of quartz, calcite and slider
lite. Seams of we'll crystallized terra
end of the drift. The tetrahedrite is
clearly younger than the vein quartz
but nowhere was it's relation to chal-
copyrite or galena clearly shown. In
the main vein on the 11O0-foot level,
east of the crosscut, the ore occurs in
shoots separated by barren vein mat
ter Some of the shoots are rs feet
long. The oXidized parts of the vein
are coeXtensive with the shoots of
lead ore. AT the west end of the drift
chalcopyrite, galena, and tetrahedrite
occur in the quartz and carbonate
gangue, but the distribution of these
minerals is too scattered for profitable
mining. On the east end of the drift
calcite is very abundant in the vein.
The ore shoot on the 900-foot level
contains about per cent of lead.
Shipments of crude ore contain an
average Of 754 per cent of lead, with
S3S ounces of silver and O.O1S ounce
Of gold to the ton. About or tons
of crude ore is sorted by hand each
day.
The concentrates consist principally
Of cerusite, galena and some tetrahe-
drite and chalcopyrite. Smelter re-
turns of the concentrates gave an av-
erage Of 50.65 per cent of lead, with
| 6.23 ounces of silver and 0125 ounce
Of gold to the ton. The crude ore anG
concentrates are smelted in the smelt-
er at Northport, Wash, where the
ore Is desired because Of it's FREEDOM
inant carbonate.
The mill has a rated daily capacity
of 100 TONS but at the time of visi
between 70 and 80 tons day was be-
ing treated. The equipment consist!
of jigs, tables and vanners, which
make a saving of 70 per cent Of tn,
lead content Of the ore.
The Hypotheek vein is uniqu,
among the veins of the Pine creek dis
trict in the association of the suphid'
and gangue minerals. The aIbundanc,
of galena in some parts of the vein
and the association of chalcopyrite
tetrahedrite, arsenopyrite and galen;
in other parts are noteworthy feat
ures. Sphalerite and pyrrhotite
which are common in many of tn
veins of the district, were not observ
ed in the Hypotheek ores. Tetrahe
drite, which generally carries a higl
silver content in ores of the Coeu
d'Alene district, is barren of this met
al in the Hypotheek mine. A partia
analysis of the mineral by r. c. Well
of the geological survey gave 36.5 pc
cent of copper, no silver and about 2
per cent of anthony. The silver @
the ores is therefore probably contain
ed in galena and the gold is probabl
contained in chalcopyrite.
Big Eight.
! The Big Eight tunnel is in the MEL
Sec s, IT. 48 NJ, r.. Q E., on the ives
side of Little Pine creek. The work
ings aggregate about 200 feet an
consist mainly Of a tunnel who's
, course Is s. so degrees w., with shol
! drifts on two small veins intersecte
, by the tunnel Thnly banded gra.
, blue and black shales and quartzite
Of the Prichard formation are til
> rocks of the tunnel section. The fol
, nation strikes from north to N. 30 dc
: grees w. and dips 50O-S0 degrees
A vein intersected by the tunnel 81