The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1900-09-24

samplers and the hand sampiing HQor 60
way of No elevator From the lower
storage bins the sampled ore is drawn
on In cars Ia proper proportions from
which 10 maintain the desired mixture
for the pain mill and discharged into
hopper above the lower terminal of the
skipway TO the mill, so that one man may
load the skip by opening gate and at
The same time operate the hoist sending
II to the main plant. where II dumps auto
natically into the main storage bin. All
the ore Is crushed to i-2 mesh or smaller
In the sampling mill in order that the
most accurate sample may be taken. as
well as TO avoid having any coarse crush
Ing machinery CT roughing rolls In the
main plant.
The Reduction Plant.
The extreme dimensions of the reduc-
tion mill are gi5x2So feet. and II Is built
In eight sections or departments on
seven different levels, the vertical height
between the highest and lowest floor be-
occupied by COTTON storage bin. The
second section, 5si1 KS feet and II feet be-
low the first, contains two 2sx5 feet re-
volving dryers: at the north side OF this
section. and on a level 10 feet above. Is
located the main engine room and boiler
house. 3fxi0o feet In size. The boiler
plant consists OF six 6o-fnch by le feet
return tubular boilers of a combined ca
pacity OF 600 horsepower. The engine
room contains a 1s0-horsepower Lane &
Bodiey Corliss engine for driving the fine
crushing machinery and dryers; an air
compressor for the mine and n 40-horse-
power engine and generator for electric
lighting purposes. The boiler plant also
furnishes steam for an s0-horsepower en-
gire IN the sampling mill and for three
other engines in the roasting and pre-
cipifa'ing departments and machine shops.
The fourth section adjoining the dryer
section and 10 feet below II, is 5Ts x35 feet
In size and contains the fine crushing ma
chinery consisting Of two sets OF lbxS6-inch
rolls. two sets OF 15x2G-inch rolls and
three s-foot ball mills and the necessary
elevators and screening machinery TO
bring the ore TO the proper fineness TO
20 10 the next section below. which is
the roasting department This level is
Sl5y67 feet and 10 feet below the fine
crushing section, and contains cotton
finished ore hin and three straight line
roasting furnaces, each having a roast
Ing hearth i0oxi2 feet and a capacity OF
tons each per day: The sixth level Is
floor. Here are the teaching tanks. six
teen in number. each % feet square by
sls feet deep. having capacity Of ITO
tons Of ore In the center OF the section
and feet above the tops OF the leach
ing tanks IL roasted ore storage bin OF
30 tons capacity. from the bottom OF
which ore Is drawn 10 fill the tanks by
means ~ cars running on two parallel
tracks. on top OF each row OF tanks, and
shove the teaching tanks are also located
three fresh pollution md standardiziug
tanks each II feet diameter and 10 feet
for teaching the ore~.
The next level. Is feet below II 5si<xas
feet and here the rold-bearing solutions
are drawn on from the teaching tanks
and the values precipitated from them
and collected. This section contains two
values precipitated from them and COLI
iected. This section contains two gold
solution tanks II feet In diameter by 10
feet deep. two precipitating tanks ~ feet
In diameter hy feet deep. four 2s-inch
thirty-sIs section filter presses for COLI
Letting the valuable precipitates, one
stump tank "A feet IN diameter by feet
deep. for collecting the spent solutions.
and two solution and ono vacuum pump
and an engine 20 drive them, The last
contains tanks. filters. furnaces. etc for
freeing the impure precipitates from
base metals and foreign materials and
melting them into gold bars. The method
OF reduction To be employed IL fine. dry
crushing. roasting, cyanidins with GER
tain departures In detail from the stand
ard practices. and nrecipitating by
gravity from tho main storage bin into
the dryers. which IN turn discharge u
into the large rolls which u passes over
screens to the small rolls and thence
over two series ~ screens consisting Of
three s-foot hesagonal screens and three
exs-foot Jersry Columbia separators.
The fines from all the screens go direct
ished ere storage bin In the roasting SEQ
tion. and what VIII not pass the screens
after having gone through the two series
OF rolls. i returned 90 ths bail mills,
where Il II ground and returned 20 the
screens until ~ has All been reduced TO
the required uniform unrness. From the
finished ore storage bin the pulp drops
direct into the feeders ~ the furnaces,
where " f. properly roasted IN passing
through the teo-foot roasting chambers.
and T. then automatically returned - its
starting point. which u reaches sufficient.
W. cool to be- discharged into the roasted
TFt -
and this latter operation u also made
automatic by means ~ elevators and belt
conveyurs. when = teaching tank has
been ilied with ere ~ the means f0rmss-
Isl described soluilons are run on u al
the top. and percnlatinE thfnush the car
go. are dfaWr OF through pipes N The
Traction has been reached. when the
charges are allowed 90 drain Thoroughly
and the worthless taiitnge discharged
through lsrse gates provtded m The bot
tom ~ the tanks. The discharninR ~ the
taiiings MAY b. done hy flushing oef with
water into waste iauufofs below. or ~
sh0vsiina inte ears which run an tracks
below AFTER the solutions have had their
values preciritated cat - them On the
prertptfa Tins sertipn. they Auw into the
SUNNI tank. from which theV are rufsped
20 the tanks above ths lsaehing tanks.
e sss''''s ss saia' All ,hs ie,ssins ~
solution tanks are built - steel
sheets and ne tuIliinEs are
frnmu throughout WIN fAFfN &MNFN NNH
roof They ere painfsd IN re outside
ard whiiswsshed 'usils ~ Ore pr1tee.
tfnn and better iEht eTrfis fhe sfnnss
and sasss are carried away ffon ne
furnace hy "A bfift 80 feef s1uare
inside era as feet tlnK 81 q Hfrei sfark
w feet hish sna fesi IN tiansisf ~
cnted adjacent e. fhH fnF eFHif.n ~ fHs
mill A Thoroughly fgU'rpfI wnrhIne
and blar&srifh chop has been provided
81 well aF fNfnnfl.,'lnuH q Hrr f0aHls aaaa
oricf and laboratory Wood if nHrreslf-
ir used far fuai fof the haNefs farnaHss
anl divers Several nlIlra ~ Sol N1rns
are Just hrfuF Completed a1 fhHf furI
NAV w. raa o. re lowest rusf Afisf
The fret faw ufHrffa 200 ra fHr ores
from tfe EfUHriif usinH. fff WIN nHi a.
e general rusfasn tufIHfsr HH frH ores a
thf cnrnr. end o. rafaaUHr. uhlTh nsI
he - tors pr fsr on HfHrffrE erf ~
increased 81 leo rars effk fas rrTa -
[ output 20 fhe r7rf. fn ffns sN FFrf0refs
will have a rHrferIrrf art frHfF rfHfaf
ftr fhslr affa 1na rIHnf frs zen 81
{ tesignt1 tnsf irrrrHrirE o. rnHa.fH F.
any desired rEffrf el. rrf fHfeffrfs Or
The least with o. Urrfra.rf .f1afaf.nr
Q q NlfH aaHHr.n|..HHa H...HM rHrn.|H