Elk City mining news. (Elk City, Idaho) 1903-1913, 1905-01-07
The Horseshoe Mines.

Homestake excepted, is the Horseshoe
combination of mines, located about
the northern base of Terry Peak and
vicinity. 1t comprises some of the
Oldest and best known mines of the
Cambrian formation. The town which
has grown up about Homestead prop
critics and it's neighbor, the Golden Re-
ward, is called Terry, and is situated at
an altitude of 800 feet, which is the
greatest altitude Of any town of consid
cradle size in the Black Hills. The
Horseshoe mill is of 120 stamps, with
it's extensive cyanide equipment, is sit
uated on the hillside uear the town.
The company owns 2100 acres of pat
ent9d mining ground, of which 1000
acres are on Bear Gulch and the re-
mainder on the depression east of Terry
Peak known as Ruby Basin. The mill
is on the Great Mogul claim. Other
mines are the Welcome and Snowstorm
two of the first mines extensively
opened on this formation Horse
shoe. Hardscrabble, Ben Hur and sew
eral others. Prior to 1902 these mines
produced over So, 100000 in gold, most
of whice was obtained by the chlorina-
ton process at the mill at Puma, on
Whitewood gulch, two miles above
Deadwood. The company also controls
the Nationel smelter. at Rapid City,
where the high-grade ores are treated,
the low-grade material being treated by
cyinidation at the mill at terry.
The peculiar ores of this section-a
highly siliceous quartz rock, occurring
in beds interstratified with the forma-
tion-are found through vertical range
of several hundred feet. 1t is said that
the best ore mined by the Horseshoe
company is from the deepest workings
r on the lowest contact of the Arch
ean schists with the basal Cambriar
ouartzite. In the Ben Hur the ore
shoots range from a few feet to Ion
feet wide, lying nearly flat and from
: to IL feet in thickness. The mine pro
duces about 100 tons of $40 ore daily
t The mill is two miles from this mine
, and the ore is hauled by contract will
the railroad company for rs cents pc
ton. In the Sunnyside mine is an or
body 40 feet in thickness. This or
e body lies 600 feet higher than the or
D bodies of the Ben Hur and almost oil
rectly over them; but as the Cambria
, formation in which these ores occur
: known to be not over $50 to 300 feet /
: thickness, it is presumable that POI
t ton of the 600 feet is represented b
p one or more intrusive loccolitic sheet
>. or stills of rhyolite, or other eruptiv
rock. All of the mines of this locallt
are found under conditions approx
imately similar. The Ben Hur is opene
by tunnel which has slight downwar
/ grade through the Arch@an schist:
e and, cutting a dyke inclosed in tn
, schists, beyond which fault )hs
. brought the quartzite of the Cambria
down to level with the tunnel, tt
e porphyry dyke turning over to the We
e into SILL there being about six feet
Is calcareous shale between the QUARTET
,e and the SILL Immediately on the ca
-, of the dyke and beneath the sill is
large body of orc. This ore is believe
'e to have resulted from solutions passir
N upward through a vertical assure ass
I'd ciated with the intrusive dyke roc
j. This assure was about three inches
> width and filled with large, well form
crystals of quartz, which were attach
:" to thin selvage of silica lining the Fl
S sure, the crystals projecting from eth
ct side into the open crevice. This pee
is liar assure was also the repository t
" rich ore. In another mine about m
to the northwestward, vertical fissul
- passing through body of silicious G
n rich in gold, contained high percenta
at of lead and was rich in silver and go
no. The flat bed of ore associated with
fssure contained no more than tra
=, of lead, but carried good values in 60
III At another claim a white sacchoric
tai quartzite contained 1000 ounces silly
de per ton, which was disse minated
Is. grains and scales of chloride of silv
,,,t At one locality in the Ben Hur mil
- Il L. I