Omaha daily bee., 1902-06-16
IN THE BLACK HILLS
Hidden Fortune is Putting in Mill with
Several Novel Features.
ORE IN TREATMENT HANDLED BY GRAVITY
Placer MininE on Rapid Creek Takes
q Boom and Good Results
obtained by Use Of
h

DEADWOOD, s. D., June 15.-(specialO
Work on the Hidden Fortune company's
big mill was started last Thursday. the
contract for building It having been let
70 the Colorado Iron Works company.
Til mill will be in many Instances an
innovation in treatment plants. as the
following description Of II will show:
The mill will have sixty stamps for wet
crushing cyanide treatment and will be
placed on the outcropping bedrock OF the
southerly slope Of the hill in whitewood
canyon one and one-half miles below Dead
wood, a substantial end ideal site for a
gravitation mill, and as nearly automatic
In operation as possible to construct a
quartz mill. The ore will be delivered
into railroad bins by the cars, over which
the car tracks will be laid, which bins
will have a capacity OF three days supply
Of ore for the mill. The ore will be drawn
from these bins and go first to the crush
ers and fall by gravitation through the
pulyerization and teaching process from
floor to floor and tank TO tank. the refuse
pulp relieved OF it's value finally lands in
Red creek. Arrested at times during its
progress for chemical action the material
will pass downward automatically without
elevation or rehandling from start to finish.
Use Compressed Air.
The most important innovation in this
plant will be the Introduction Of COM
pressed air through extensive piping Of the
teaching and slime tanks for the double
purpose OF agitating and ORIGINATING the
material. The bottom OF the tanks will be
laid with pipe with one-sixteenth Of an
inch aperture in every three inches square
for the passage OF the compressed air into
the pulp. Two and one-half pounds prcs-
aur. 49, 4-zh iii - -a " a..
teaching tanks and thirty pounds pressure
in the slime ank The shines by over
flow from the large teaching tanks will be
conveyed by launders to the slime watts,
which will be charged with a strong cya-
hide solution. The same tanks are twelve
feet in diameter and sixteen feet deep for
the reason hat the shines containing but
one part OF solid material to nine parts
Of water will concentrate and settle to
better advantage in a deep vat. The slime
tanks will be placed in a series and quick
agitation under thirty-pound pressure OF
air causes an overflow Of the shines pass
ing from one tank to the next in the
series. When the slime tanks are one
third full Of sand the teaching is finished
and the watts are decanted. the solution
being piped to the gold tanks for precipi-
tation OF the values and the sand sluiced
INTO the talllngs pile.
New Machinery =t Columbia.
ROCKFORD. s. D.. June 1~5.-(special. y
The Columbia Mining company. the ground
81 which lie situated a short distance from
this camp. Is making arrangements to in
stall some new machinery on Its ground.
An air compressor plant will be erected al
once and power drills put in. The working
shaft has now reached a depth OF seventy
feet and operations will be continued from
this level and the shaft continued for q
depth OF several hundred feet. The pres.
ent workings are In ore and the shaft will
continue to follow down the vein. When q
sufficient depth has been acquired stations
will be established and the work OF stopping
out ore begun. The ore is a free millins
proposition and the values which 1t carries
are Of a good commercial grade. The weir
10 an extensive one and the ore is said
to be of an average richness, and so lay.
Ing as to be very easily worked.
The Double-standard. situated near thit
camp. Is also working a number Of mel
and Of late has been taking out a PRETTY
tair grade Of ore. which is being piled unit
such time as the company shall erect
mill OF its own to treat II, the greater par
OF 1t being Of too low a grade to ship FOL
any distance or by the present transporta.
lion facilities. Scattering through the vein
however. are numerous rich streaks, an,
this character Of ore is being separate,
from that Of the lower grade, and Shipment
? 1t may soon be made. The property Is
however, a big low grade proposition and
like all other mines OF that character. It
ore must be treated at the ground and d
a large scale to be made a paying PROPOSE
ton.
Big Cleanup at S~pearhsh.
DEADWOOD. S. D., June I5.-(Special)-
superintendent Brown Of the Spearhsh com
pany came down from Ragged Top on Tues
day, and with him brought the sentimental
cleanup of the company's cyanide plant o.
johnson guleh. The cleanup weighed Il
the neighborhood of $4,000. The mill 1
running steadily on ore from the company
mines. which. since good weather has Sc
In. has no difficulty in supplying all tina
Is needed to keep the plant going.
A California company has recently invade
the district in the neighborhood of tn
spearhsh company's ground and now hold
an option on $50 acres of some of the hes
ground 10 the district. Included In tn
ground bonded is that owned by Starne
Bros, Doyle & Sigler and the Ulster grou
OF claims. 1t is all good property and frli
It has been shipped some very rich ore. o
all of the groups there are good exposure
OF ore, which have received considerabl
development, and there Is enough in sigh
to keep a large-sized plant running contin
ually for years. II is said that the ne.
company will put a force OF men at wor
opening up the known ore bodies aud en-
deavor by so doing to get a better idea
their extent. The ground is bonded for
high figure. as II has always been lo1ke
on as some Of the best In the district.
Allen Bros. will start up their thirty
ton cyanide plant on the ~tailings dump
the old Iron Hill mine at Carbonate tn
week.
Operations on the Castle Creek company
ground at Mystic are progressing favorsbl
and the tunnel, which was started In fro.
the side Of the property. bordering on n
Btttersweet, has been driven in for a cor
siderable distance. This tunnel. which