The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1913-10-16

though the gold-quartZ veins all car
ry a little galena, yet the striking
feature about them is not their sim
ilarity to the lead-silver deposits, but
their rather marked difference in
structure and in neurological char
acter No deposit has been found. so
far as .known, which suggests any
transition between gold-quartz veins
of the Murray type and lead-silver
deposits such as those of the Barton
| (Prichard) formation" A typical
Prichard type vein, the Terrible Edith,
occurs near the principal old gold
quartz mine, but Il little higher, alti-
tudinally and stratigraphically. The
foreman says that the ore on the mid
die level contained 81 gold per ton,
as paid for by smelling companies.
| This indicates that the Terrible Edith
solutions came into contact with n
gold quartz vein and that the Pri-
chard type of lead-zinc deposits Is
younger than the Murray gold veins.
J have no intention of committing
myself to the idea Of magmatic Or
igin for the gold, but | submit that
the gold veins are of the type that
would be expected If derived form
the deep-seated portions of the great
quartz-monzonite batholith. and the
lead and zinc veins are not.
The copper veins in the Occur
d'Alene are of two types, In one,
the primary naturalization was py-
rite and chalcopyrite impregnating
certain porous bands of quartzlte
These veins are parallel to the bed
ding The other type consists oi
quartz veins with occasional pockets
of chalcopyrite. There is usually
some pyrite and in some veins con-
siderable galena. These veins cut the
bedding They appear to be more
Independent of the formations, than
are the lead veins properly so called
and as numerous in Wallace areas as
| In Prichard. They are also more in
/
ance of the rocks. From this fact
and their meteorological composition,
they appear to be more likely to be
genetically connected with monzon-
tie that may be presumed to underlie
the entire district than are the lead :
zinc veins The galena present in
some of the copper veins may have
come from the magma or may have
the ascending solutions. Even the
copper inpregnated bands may have
derived their minerals from solutions
emanating from the magma. Some
of the copper veins have, little gold,
while others contain 81 to So per ton.
The silver content varies from near
ly nothing up to 10 to Is ounces per
ton.
Silver Bearing Lead Ore.
In the lead mines of the Coeu.
d'Alene when the silver ratio exceeds
0.5 ounces to each per cent lead, the
excess is nearly always due to the
presence of argentferous tetrahe-
drte. This mineral appears to be
distributed somewhat Independent of
the lead and occurs, with chalcopy-
rite and small quantities of sphaler
/ lite, in bodies of siderite and pyrite
that contain no lead. Without COM
hitting myself to the theory, | say
that this argentiferous tetrahedrite
may have been derived from the mon
zonite magma.
| In territory about one and one
| half by two miles, in the range east
/ of the Steptoe valley smeltcr at Nc
Gill, White Pine county, Nevada,
there is a group of small lead mines
that have produced some shipping
ore. At the time of my visit in 1905,
estimated that there was about II
tons of shipping ore in sight, but the
character of the deposits is such that
no large reserves would be carried.
Small pockets Cup to 1000 pounds
weight) of rather coarse grained ga
lena are irregularly distributed
through lower Cambrian limestone,
without any apparent connection
with deep extending assures, though
hey are largely associated with