The Weiser signal. [volume] (Weiser, Idaho) 1890-1904, 1900-05-17

sisting of highly black states and
Between Peacock and
Saddle is an irregular area
Of diorite, which when analyzed
shows "a per cent of silica, % per
cent of alumina and ferric oxide, and
small portions OF lime, magnesica,
soda, potassa and ignition. Extend
ing from point south of the Pea
cock claim is a narrow band of high
ly crystalline limestone, or rather,
marble This is inclosed in diorite.
MINERAL DEPOSITS.
The principal interest centers in
the Peacock claim, which has been
developed more than any Of the
Others, and which shows a large ore
body. This claim is situated near
the head of Deep creek, and is one
Of the most northerly claims in the
mining district 1t was the first one
located, having been found by miners
who were making their way up the
creek prospecting for gold A little
placer work has been done just be-
low the claim, the gold evidently re-
sulting from the decomposition of the
copper ores. The deposit is well ex
must be sought in the superheated
waters which accompanied the in
iruson and found their way from
the cooling magma, which evidently
was in S ate Of aqueous fusion. The
origin of the copper ore is, therefore,
pneumatolytic. 1t is by no means
unlikely, however; that normal veins
may be found in the vicinity.
SIMILAR DEPOSITS ELSEWHERE
1t is well known that many iron
and copper deposits similar to this
occur on the contact of granite rocks
and limestone. There are some not
ed deposits Of his kind in the old
world and there is no lack of them
in our western country along the
Cordilleran mountains, where intru-
sive granite rocks are so abundant
l have noted similar copper deposits
in California in several places, though
as a rule they are not economically
of great importance. All are charac-
terlzed by gangue of garnet and
epidote, and the ores are apparently
always bornite and chalcopyrite.
None of them seem to be connected
with assures or fault planes. One of
these deposits is found near, the
road from Coloma to Pilot Hill, Ell
dorado county; another in the canyon
of the Middle Fork of Cosumnes
river, three miles northeast of Fair
play, also in Eldorado county. Still
another is found in Happy valley,
Alpine county, and is known as the
Barnes mine. According to reports
there are many other deposits which
may be referred to this class; thus
for instance, the copper prospect:
near Houston, in Lost River valley
Idaho; some deposits on Boundar,
| creek, in British Columbia, ant
Others on Texada island, in the sam
} province. From the reports Of tn
provincial mineralogist there canno
t be much doubt of the character o
r the last mentioned deposits Mr.
Ordonez mentions the occurrence o
g similar deposits from several place
in Mexico, where intrusive diorite
( come in contact with cretaceous lime
t stone. There, as in many other case
these contact deposits appear to carr
t some gold.
{ OTHER MINING DISTRICTS.
f GA road from the copper mine
8 leads down into the Snake Rive
: canyon at Little Bar crossing, thenc
: over into Oregon. Two miles aboy
e Little Bar are the Ballard cope
r claims, the principal of which is til
e River Queen. These were not visi
s ed. About six miles southeast {
g the Seven Devils copper mines, an
v eight miles northeast of Bear pos
Ii Office. is the Placer Basin district
j. where gold quartz mines are reported
n Similar gold quartz veins are foun