Idaho County free press. [volume] (Grangeville, Idaho Territory) 1886-current, 1897-03-05

SNAKE river.
The crown and the northern and
eastern sides Of the mountain are
of gray eruptive gran
lite, considerably decomposed In
places. Here and there are found
of a limestone stratum.
The base, or rather about three
fourths of the west and south
slopes of the mountain are cover
ed with porphyry, and the foothills
sloping away to the Snake river
are composed Of the same material.
Between the porphyry and granite
is an intercalated stratum OF various
thick ness, and at places it disap-
pears entirely. 1t is next to this
limestone, or replacing it entirely
that the Seven Devils copper vein
is located. On the northern end,
at the Peacock mine, the vein crops
at an altitude of 600 feet. From
this point it takes course trifie
west of south, then south, and
then southeast, swinging in a semi
circle around the mountain, and
showing itself over a course OF
about five miles in length, and los
ing in altitude about 1900 feet. In
one place (the Peacock mine) the
ore body as exposed occupies a
nearly horizontal position, while a
mile south the vein was found
standing vertical, and between
lime and granite. Sill further
along on the vein southwark, prob
ably mile distant, a tunnel driven
in a northeasterly direction, dis.
closed lime, porphyry, lime, ore
and lime again.
Associated with the ore are vast
bodies of garnets, doubtless result
ing from an alteration of the &C.
companying limestone, also iron,
quartz, calcspar, amphibole and
chrysolite.
| DESCRIPTION OF THE MINES.
The Peacock mine occupies the
northern terminus Of the vein. Its
outcrop, or expose ore mass covers
about $50 feet of the apex of a
ridge, and down its northeasterly
slope for $50 feet or superficial
area of $4,000 square feet. 1t is
apparently mass of copper ore in
place. Some sluicing for free golt
| in the detritus had taken place. Or
the west side of the ore body erup
tive rock is disclosed, on the cas-
side granite, and on the south {
mass of garnets and on the nortl
amplitude and chrysolite. A shat
25 feet deep passes through a mass
Of decomposed limestone, oxide O
iron, manganese and copper, car
Donate ofcopper, siliceous sands;al
average sample returned 4 ITO pc
cent of copper. Going over tn
surface, the indications and exca
vations made would warrant tn
conclusion that the ore average
at least fifteen feet in thickness
over the $4,000 superficial feet {
} ore exposed. Ofthis amount prot
ably one sixth is bornite, that re
turned an assay Al 40 per cen
copper, and Is ounces of silver, an
one-third is carbonate and silicate
r which sampled gave an average ,
II $40 per cent metallic copper.
The Peacock mine was the
owned by Albert Kleinschmidt I
2 Helena, Governor Houser, an
other capitalists of Montana. Th
2 same syndicate also owned til
l Blue Jacket, Copper Queen an
other lodes on the same vein, ha'
ing invested about $500 in tt
: purchase of these properties whe
they were mere prospects abo'
twenty years ago.
g Following along the vein soutl
g ward, the next property is tt
S South Peacock, which was beir
e worked at the time under a Dor
i of s12, 900 by NJ. L. Hoyt Of Weis
r City, presumably on account
t w. A. Clark of Butte City. Sc
+ eral openings on the lode a fe
: hundred feet apart, show regul
# vein. of two to eight feet of ca
: Donate ore, from which ASA
8 have been obtained of Is per ce
n copper, Is ounces silver and
r ounce gold.
l. From the South Peacock mi
70 southwark for a distance of near
q a mile the vein shows only faint
IS and in many places is covered
a surface wash and soil, and whe
oi opened it is not so strong as fUu1
l. in the Peocock.
10 At the Lockwood mine which
Oh situated ON the west slope of t
mountain facing Snake river, t
vein again shows in good strengt
l. At an altitude of $3.50 feet, Gre
Or pings show very strong and sh;
. r on faof IN Ianfb cbomnI A foot