The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1896-10-24
MINES AND MINING.
written for he Ros<.ana Miner by J. L

w sfSten Tor TIE RcSSszE9 MsHsc by j. L.
Waraer.g
The O. K vein cuts d4agonzlsy orr Of
he mos, PERCEPTIONS mountains ia the
Trail creek district 4 xuich. discsrnioie
at long distance. distinctly traces on the
mountain the nss8r@'s course. \ d.st-r-
gushing feature Is the natural advantage
Of great stepping height. permitting many
Levels 30 be driven On the vein without re-
course 10 sinking. with SIS attending IN
crsassnx expense OF hosting. pumping and
ventilation Inc vein. from Ave 10 seven
feet In width. thus presents section upon
which levels or tunnels may be driven on
the ore Al the extreme boundary line
Los feet OF sso2tng height becomes avail
able The most favorable conditions for
mining. and the most perfect arrange
meats for economic handling of Gre, are
thus made possible.
Above each level. at Intervals OF 10 feet.
are tsmbered ehutes- These chutes are
naied from The Slopes as the ore Is mined.
being extended upward as Stopping ac-
sances- The mine cars receive the ore
from the different chutes by opening their
respective gates Ore from the Slopes OF
the upper levels. as well as from the adj
saiicing drifts, descends by the enuses in
the connecting wines. between levels. TO
the lower or main working level.
The mine cars OF this level deliver ore 10
rhe mine ore bins. situated at the upper
terminal OF the tramway. The mine is
equipped throughout with iron track and
iron cars. the latter having a capacity of
three-quarfsrs of a ton Of ore. Within the
mine the chuies themselves AFFORD large
storage capacity for broken ore.
The rramway connecting mine and mill
IS go feet in length. II il a gravity Line.
From the mine terminal the inclination
OF the trestlc. which i 10 feet above the
ground. Is 30 degrees for the first quarter
a al 10 ~ IN "a
degree slope at the mill. Two ore cars.
each OF half-ton capacity. run on separate
parallel tracks the width Of fressie. permits
ting the laying of fous rails. They are
loaded alternately by means OF levers OPP
Grating the ore-hin gates and are con-
troiied In descent by the brake operated
by hand power Arriving at the mill they
dump automatically onto l6-foof grizzlies.
which allow only the finer material 10
pass through to the ore bins below. the
coarser ore failing 10 the crusher floor.
Convenient 10 the mill are the mine and
mill employees quarters, boarding house.
assay office. company once, foreman and
managers houses.
The dimensions of the main mill build
ing are ~ feet by a. feet. The adjacent
boiler building, under separate roof. in
cludes the engine room. and Is 81 feet by AZ
feet over al. The foundation consists OF
three masonry retaining walls. each feet
length. The crusher. battery. sizer and
vanner floors are each - feet by 4s feet.
Ample light is admitted by 80 windows.
Construction material consists OF 10000
feet OF lumber. 80 squares of corrugated
iron roofing $500 bricks and $50 cubic
feet of masonry. The storage capacity
for ore in the mill is 1876 tons, which Is
equal TO the mine ore bins.
Upon this foundation rest the two 5000
pound rnortars in which the fine crushing
OF ore is done and resisting the shock due
to the fall OF 10 stamps weighing $50
pounds each. Three eiectro-silvered cop
per plates. for amalgamat.ng within the
mortars. have combined surface OF II 1-3
square feet. The apron Plates in front of
each mortar have an area of "A square
feet. Upon these amaigamat.on plates the
free or native gold present in the ore viii
be obtained After dischargsng through a
So-mesh screen and passing these plates
the battery water. carrying the sands con-
tanning the metallic sulphide particles en-
closing gold not susceptible TO amalga-
nation, liz conducted to a set Of Browns
hydromatic s.zers. These arrange the
sands for distribution TO the vanners.
There are three s.x-foot latest improved
Frua yanners and one Woodbury. concern
traitor. The last receives the finest or
slime product of the class.fiers. The sui
phure,s. called concentrates. collected by
-.
while the barren sands flow out of the mill
to waste. Adequate water supply is OBJ
tained ey leo foot fiume
The boiler plant consists of two 50-horse
power tubular boilers. 81 inches by IL feet
long. set IN brick. The engine room con-
tains a 35-horse power engine. with a No. 7
Miller duplex pump. The four-drlll air
compressor. with an elght-foot compress
sor. il connected by an air pipe with the
mine.
The crusher lis of extra large size, No.
Blake II viii receive blocks of ore nine
inches by IS inches and reduce the same
TO one and a half inch pieces at the rate of
10 tons per hour. thereby saving the ex-
pense of breaking up the large mock at
the mine.
Ore thus prepared passes from the ore
bins through gates to Challenge Eclipse
automatic ore feeders. thence under the
stamps and over the vanners as hereto
fore described The concentrates will be
shoveied into cars which stand on a three
car switch. the mill being but 800 feet from
the main line of the Red Mountain rail-
way.
The stamp mill machinery. boiler and
engine, were furnished by the Jeuckes
Machine Company. of Sherbrooke, Que
bee: the compressor plant by the Cana
dian Rand & Drill Company. of Sher-
brooke. Quebec. trarnway line, ciasssfers
>. II
Chalmers, Chicago. and Woodbury. Manu-
featuring Company. of San Francisco.
Cal
The mill is built for IS stamps. The
power drills are expected 10 advance two
drifts at a time at such a rate that the
additional Is stamps may soon be added
without the effect OF diminishing the
present ore reserves and VIII maintain a
regularity Of output. By this provision
for an increase of stamp capacity little
time Will be consumed in their inssalla-
ton.
The cost of mining should not exceed
s. 80 per ton. delivery OF ore by tramway
cents per ton. milling expense 3t4o per
ton~making i total Of 80 per ton.
The sme.iiag ore product OF the mine
ard the concentrates VIII cost $40 for smell
ter reduction. corresponding 10 the base
ore treatment charge OF the district. The
great characteristics OF this property Is
shown by the treatment charge Of about
81 fer the free-gold extraction. To this
class belongs nlne-tenths of the ore M ned
afford.ng an unusual margin of profit by
reason OF the high grade ore reserve
awaiting treatment.
ALL OVER THE SLOGAN.