The DeSmet leader. (DeSmet, Kingsbury Co., Dakota [S.D.]) 1883-1891, 1890-07-12
DAKoTA's TIN MILL.
The First One In the United States
Now located In the Slack Mills.

The First One In the United States
Now Located IN the Black hilIs.
The mill OF the Glendale Tin Mining
Company is the first tin mill estab-
lisned in the United States, says the
Rapid City Republican, and from
which is now being put out the first
fruits OF the Dakota tin mines. The
mill in located on Iron Creek, about
% miles southwest OF Rapid City, at
the foot of the mountains in which
the mines are situated. The mill
proper measures so feet in width by
100 feet In depth, and 10 divided into
three stories. 1t is unique in plan,
compact and convenient, well built in
all particulars, and protected from ah
danger OF fire by u system OF water
pipes and by having roots, ETC., cover
ed by thick asbestos covering.
Either steam or water power may
be used for running the machinery.
The steam equipment consists OF two
1o0-horse power boilers, and r. 100
horse power high speed engine. The
water power equipment consists OF q
fiume 90 by 25 inches in section, bring
ing the water from q dam on Iron
creek, one and one-quarter miles dis
tnut frons- tlse- NALL, eiRlDg % ~head OF.
100 teet pressure at the wheel. About
500 miners inches OF water are sup
Piled TO the turbine wheel. which was
manufactured by Craig, ,Ridgeway Il
Co., OF Coatsville, Pa. The water
power will be used except during the
cold snaps in the winter, the engines
being placed in the mill as reserve
power in the case OF accidents.
The ore is hoisted from the main
shalt and dumped 6rst into an iron
ore bin of 900 tons capacity, located
high up the mountain over the mill.
From this bin it is conveyed to the
mill by wire rope bucket tramway,
the loads going down the hill to the
mill, haunng the empty buckets back
to the mine. The ore buckets me-
chanIcally deliver their contents into
175.ton ore bin above and back OF
the mill. The large Jumps OF ore are
crushed, first by q Gates crusner, then
passed through drier to set OF
Gates improved Cornish rolls; thence
elevated to q set OF rotary sizing
sieves. From the sieves the finer
sizes are conveyed to set OF Para
dox concentrating tables and the
coarser sizes to a common Hartz
ilgs. The screens, jigs, and concen.
traitors, separate completely all the
mica, quartz and ieldspar, leaving
clean concentrates OF cassiterite, or
oxide of tin, ready to be smelted into
tin bar. The concentrates are for the
present being shipped to Chicago to
be smelted, put it is the intention OF
the company TO erect at once asmelt-
ing plant in the hills. The first ship
ment of concentrates to Chicago
yielded 65 per cent OF metallic tin,
and the second shipment 68 per cent;
and it is expected that with more
practice they will yield over 20 per
cent.
The main vein measures from 2S TO
80 feet i'm width at the outcrop and
over 40 feet in the lower working.
There ig no doubt as to the true fis.
sure character OF the vein, as IL cuts
the states at nearly right angles, and
has well defined polished walls with o
thick clay gangue or cleavage. The
vein stuff is principally albite white
ieldspar), with here and there white,
CLASSY q.....tsY n..zrsis.i &c - -crystals Of
tin oxide are disseminated all through
the vein material, varying in sizefr0m
crystals weighing an ounce or more
to those as fine as grains oil pepper.
Assays and tests from the different
workings give an average OF over 3 per
cent metallic tin, while picked orspeci-
men rock is often blasted that will
yield over 80 per cent OF the white
metal. With these large bodies OF
ore, and the excellent facilities for
mining chsaply, there Is no question
but that this present mill, with q
capacity OF crushing and concentrat-
ing 100 tons of ore per day OF "a
hours, will soon be supplemented by
still larger mill.