The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1913-10-23

greatly crushed and faulted. 4 quartz
siderite vein from three to six feet
wide, which strikes north - degrees
cast and dips vertically, is exposed In
the adit but is cut off at the face by
a northwestward trenching fault A
band of ore from six to eight inches
wide on the north wall of the vein
contains tetrahedrite. chalcopyrite,
gaena and pyrite, The ore Is said to
yield high returns In silver
Bryan.
The Bryan is one of the more ex-
tensively developed properties in the
basin of Packer creek, although 1t has
not made shipments. II Is on a trib-
utary of the west fork of Packer creek
at the end of a wagon road from Sal
tese. about five miles distant. 1t has
three adits, with vertical range of
about 500 feet About $500 feet of
horizontal work has been done. and
lowest tunnel Is connected with the
one above by raise
The country rock penetrated by
these workings consists of more or
less sercitic uuartzite, and probably
and the Revett quartaite, The struc-
ture Is too complex and too imperfect
~ understood to be characterized sat
isfactorily and briefly. The beds dip
steeply and are considerably folded.
IN places they are traversed by broad
zones of crumplipg and MASKING as
well as by more sharply defined fis-
sures most of which have north
westerly strike.
The principal vein strikes about N.
60 degrees Il. and has a steep dip to
the south. Its chief gangue mineral
Is siderite, which is cut by small veins
Of quartz. The ore minerals are py-
rite, galena and gray copper The
maximum thickness of this sderitic
vein Is about s feet, but In places 1t
pnches to thin dark seam by post
mineral shearing, In the highest tun
mel (No. ~ this vein Is cut off on the
east by a fault of northwesterly strike
and a dip Of As degrees--65 degrees
4
/ this fault Is not known. ii has not
| been identified with certainty on the
lower levels a fault Of similar direc-
ton Is followed by drift on the No. 2
J level, and this causes only "A small Off
set Of the east segment to the north.
The fault has apparently not been cut
on the lowest level Difficulty in the
discussion of this fault Is caused by
the lack of an accurate mine map.
Some Of the richest ore IS not OBJ
tanned from the main vein but from
smaller branch which has been fol-
lowed in the raise Some ore In the
raise Is said to assay So per cent Of
lead and 1863 ounces of silver to the
ton but these figures would not be
representative of the vein as whole.
U. S. Mine.
The T. s. mine is just across the
gulcl from the Last Chance and on
the same lode. II is of interest as hay
Ing produced some ore. but 1t Is now
abandoned and it's lower workings are
inaccessible. The upper tunnel shows
la vein about four feet IN maximum
thickness, which pinches out In places
between two strong gouges. The
country rock is auartzite of the Burke
formation, thoroughly crumpled AMI
shattered. The vein matter is strong
ly oxidized being apparently similar
to that of the Last Chance.
Last Chance.
The Last Chance mine is located on
tributary of Packer creek about 8
miles north of S;altese The workings
consist of two tunnels, an lntermedi-
ate level shaft and several open
cuts, but the only accessible entrance
to the mine is through the main tun-
mel, which Is probably 200 feet below
the outcrop of the south vein. The
forest fires of 1910 destroyed the en-
trance tmbers TO the other mine
workings so that caving has resulted
and although parts of the upper work.
jngs are still accessible from raises In
the lower level the caved condition
of many Of the workings leaves much
to be inferred In regard to the rock
structure No work has apparently
been done in the mine for several
years. The main tunnel trends N 10
degrees u for 215 feet and then
branches, each branch in turn having
several drifts. Two veins or probably
faulted members of the same vein oc-
dur one in each branch of the tunnel
workings a considerable quantity of
ore has been stopped from each Of
these ore bodies above the main level.
The production of the mine Is said to
be In excess of 100000
Tho structure Is complex. The
green thin bedded quartzites of the
Burke formation strikes northwestern
~ with steep southerly or vertical
dip, but flat-lying and 'northward- dip
ping beds are also observed. The
veins have undergone the same defor-
nations as that of the quartzite beds.
In raise from the south branch Of
the main tunnel the vein strikes east
and west and has vertical or steep
southerly dip, but on the main level II
conforms to the flat beddcd structure
except where 1t Is cut off by north
westward trending fault. In the north
h,.n prt, fbn vain ci,iIync "a Jaorooa