The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1913-10-02

the workings now accessible, altnougn
a small Inappropriate dixie appears in
the eastern part of the workings and
another basic intrusion Is cut in the
outer part Of the tunnel
The bedding of the country rock
near the veins Is steeply inclined and
variable In strike, as II the
strata had been raised to nearly
vertical position by pressure in one
direction and afterward crumpled by
pressure acting nearly at right angles
to that direction. The general strike
is little west of north and the gen.
eral dip easterly so that the rocks In
the eastern part of the mine are the
youngest The ore bodies occupy mar
row shear zones rather than sharply
defined assures. Considerable atten-
ton was given to the question Of how
much movement these shear zones
represent The presence of gouge
along the slips In the lode and adja-
cent country rock is proof Of some dis
placement and the difference In the
character and attitude of the rocks on
either side Of the veins is In many
places SO sharp as to suggest that the
amount of this displacement may have
been considerable With respect to
the Morning vein this suggestion could
not be definitely confirmed. and the
sharp. steeply pitching folds visible in
the crosscut between the two shafts
show, indeed, how the observed rela-
lions might be explained without
faulting. On the You Like vein APP
preciable faulting has demonstrably
occurred, for near its intersection with
the tunnel, where 1t is narrow and
well exposed in the roof. the beds on
either side clearly fail to match. 1t
is not probable, however. that the
movement on either vein has been
comparable in magnitude with that Of
most Of the faults shown on the geo.
logic map Of the district.
Fractures transverse to the veins
are neither numerous nor important
except in the extreme eastern part OF
the mines. Here the You Like vein IN
particular is thrown few feet by
several small faults whose general
strike is about north northwest to
north-south. The vein is farther north
On the east side Of most of the faults
than on the west side. These small
faults are probably, subsidiary to 3
larger one, recognized in 1904, which
brings the Newland formation on the
surface against the Revett. 1t Is shown
on the map accompanying professional
paper 81 as striking about northwest
but its true strike appears on review
to be more nearly north and south. A
thin basic dixie parallels the fault a
few yards to the east, The ground
east of the Morning mine has been
well prospected without revealing any
| .en comparable in size to the Morn
ing vein except the Hunter lode, which
| is so far south that it's correlation
with the Morning vein is at least high
ly questionable for 1t would postulatt
a horizontal displacement of abou
half mile.
Character Of the Ore Bodies.
! The Morning vein is essentially sim
pie in structure except for large
horse, which was noted in the previ
,us report. In a great cave on tn,
00-foot level the horse is about 81
feet wide and each of the two branches
Of the vein is about 10 feet wide. TIL
length of the horse is about 500 fee
in the upper workings This horse ap
parently persists downward nearly t
the 1000-foot level where two branch
VI the vein appear to have coalesced
mum thickness of about 40 feet. Tn
vein is described by Ransome as be
ing inconspcuous and practically bar
zen where 1t is cut by tunnel No.
md it has the same unpromising char
lcter at its intersection with tunne
No. but widens in both direction
from that point
The You Like vein is of simple tab
ular form without large inclusion.
Its thickness is considerably less tina,
that of the Morning vein. being at tn
maximum ABOUT 10 feet.
The ore of the two veins il alike i
most characteristics. It's chief con
stituents are shown by analysis by tn
chemists Of the company to be presen
in approximately the following pr,
portions: Siderits, so per cent; quartz
25 per cent: galena, lis per cent
sphalerte, II to IL per cent; calcite.
per cent; pyrite, less than per cen,
In addition, small quantities of barite
magnetic. chalcopyrite, tetrahedrite
md probably pyrrhotite are present
the barite being locally abundant an,
conspicuous. Magnetic and chalco
pyrite are nowhere easy of recogni
ion. The quartz probably belongs il
part to the country rock. The veil
structure shows that 1t was only part
ly formed by the filing of assures an
partly by replacement of the wal
rocks It's limits are not sharp, al
though the limit of commercial ore !
fairly definite. and there are discon
tinuous subsidiary veins which ar
too small to mine. The ore present
widely varying degrees of richness
Some of 1t consists of solid masses O
galena and sphalerite almost unmixe