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

paper 62 Is the Inscription OF the couu-
try rock of the lode to the ST. Regis
formation; it belongs In reality to the
lower part of the Newland formation,
as was suspected by Ransome.
The principal structural feature In
the outer part of the tunnel is syn
clinal fold with st. Regis rocks in the
trough and Revett quartzite on the
sides. This main fold is much COM
plicated by minor plications and by
fractures. on many of which there
seems to have been thrust faulting
with upthrow on the north side. The
north side of the syncline abuts
against one of the most persistent
faults of the district, the White Ledge
fault Where 1t intersects. the tunnel
this has a sharp nearly. east-west
strike and is nearly vertical. 1t marks
a fairly sharp change In the country
rock that on the south being rather
hard and thick bedded quartzite and
| that on the north fine grained pale
green, somewhat calcareous sla.e,
otherwise the fault might easily be
overlooked for it is extremely tight
and inconspicuous, although its throw
at this point can not be less than half
mile. The rock Immediately north
of 1t in the tunnel probably belongs to
the lowest part OF, the Newland forma-
ton. for 1t Is succeeded with In short
distance by dull-purplish slate alter
mating with green bands, belonging to
the ST. Regis formation. These rocks
in turn are cut off on the north by a
fault whose throw Is probably less
than that of the White Ledge faul ,
yet great enough to bring blush
banded slate of the middle part Of the
Newland down against the green slate
of the lower Newland. This fault.
which is normal one dipping about
40 degrees north is probably identical
with the one that crosses Paymaste-
g,ich near its mouth and Is therefore
designated the Paymaster fault. The
greenish slate of the lower Newland
reappears, however, a short distance
north of the fault and Is the country
rock of the Hunter lode. Another
fault bringing middle Newland down
on the north is shown by surface in
dications to cross the ridge about 400
feet north of the lode, but this has
not been penetrated by the mine work.
ings. The general dip of the beds
north Of the White Ledge fault Is
southwark and very steep.
The sedimentary rocks in the tun-
mel are cut by several small bikes OF
a black fine grained rock whose most
prominent constituent Is hornblende in
the form of minute needle-like crys-
tails. None of these bikes are seen In
the lode and their relation to the ore
is consequently unknown.
Form Of Lode.-The Hunter lode is
more complex in structure than most
others in the Occur d'Alenes, a, char
acter probably due to the unusual fis-
sility of its country rock. On the NJ
5 tunnel level and above, where Il
was studied by Ransome, the lode
comprises three important veins. In
the workings now accessible there are
only two principal veins. whose pre-
else relation to the three of the upper
workings is not clear. The workable
ore bodies are ramifed and i'll defined
and much ore is distributed in masses
too small and discontinuous to be min
able. The commercial naturalization
is confined to zone that is about 1O(
feet broad on the adit level, but the
total length of the productive zone Ii
about $40 feet in the active workings
and the maximum length of any in
dividual slope is about 800 feet.
At least five ore bodies are exposed
in the present workings-two in thu
north vein and three in the south. The
general pitch Of all the shoots is near
ly vertical.
The largest ore body is probably thu
northwest one, developed by the Ryar
crosscut stope above the adit level. Ii
part of this body there was about A
r feet of good ore, but the Slope length
? of the broad part is only about so feet
t On the east end the vein is split by {
| horse into two wings both Of which