New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1897-11-07
GOLD FROM THE ORE.
VOW IT IS EXTRACTED BY AMALGAMA-
TON WITH MERCURY.
,., ,,,,,,,,. ORE, AND "CLEAN COLD
FORMS IN WHICH 1T CANNOT De
ruI.s TREATED.
r.or, The British Columbia Mining Record.

r.o,, Tho British Columbia Mining Record.
rn. question frequently arises az 10 what IS
roent by free milling gold ore ana as rmG , I'M
aortanSe in the purchase Of mine and IN me sun
senuent erection OF machinery, VIII tho aSis mai.
MS naper TO throw some little gnt on l",s Lon.
.nS nd render short description OF the va 1p
devices mechanical and chemical og We ;e sena-
urscious metal when in the free state =, ii Z.
rpated from It's accompanying gangue'o and if has
found in the rocks Of nearly az aees: Of these
been from the vast dlsntesrated, iG@sifornla and
canning the alluval deposits or C III oId has
other countries that most OF the ,heso DEPOSITS
sovn 20 great extent. been worked Out; me ~
iention of mining men has pom soirce Of the gold
Tost Of the cold of the present day Is No
from the quartz veins ana ieIseS 1rei" being fire.
nuentiy associated with iron pyrites, biendeii
sn fouppS in the mineral syvanite-a compound
OF silver gold and tcurium in nagyaglea I'D Sg'ii Il,
pound Of s nSd f1G W VGPV gaena viii here be
necessary TO consider In what conuito ,h ~. foliow
itself exists In toe rock We may ''"e '''e
Fsn which the gold occurs n clean an me P Tosk
ticaily pure and disseminated tnrouE" 'Ac '''"
In grains OF an appreciate weiSht. ,hrovob
sscond-When the gold is distributed t tnTSug gn
the rock in particles so small that lhey nave "o
apgrsca6le, Weig ;be gold is contained in the sui
rhurats ~ The ore-in which case the Gou orcuIs
ppn as true gold but as suphide OF gold-wnlc o
is black powder or II hiGy Arsenic or some
Other inp Which the gold is contained partly in
the ore aiia parstinr the gold from its ACCOMPANY
Ing advanage is taken Of the Iaes WITH
nuTe quicksilver an amalgam or alloy Of the Two ~
metals is formed the separa' Of ne1s and pass
ine the pulp over copper plates coated win 9uTk
silver whereby the sold Is reanea o on tine NoW
the gold in the rock is contained IN the SUP dr a.
have Sss sSd wi qs iH mPpn 81 f This gold
no FraS and will not combine with the quick
su,.er This therefore is not Tree nlilhs ORE.
he Of
so small as 10 have appreciate weshtLin o,n nI
words -four od ,r Ths he saved by battery ANAL
gamaton and cannot. therefore De coHSlue'elu o.
free milling In the shEs wfsh, are
through the rock the gold will readily amaigama,e,
s, Zen which the gold distributed through
the rock partly as grains of clean sulphureis inns
is OF frequent occurrence in ms country an9
an ore Of this DESCRIPTION contains sufficient free
gold 10 allow Of Is being treated proni by me
a free milling ore; but IL. the other hand. the
bulk OF the gold is contained in the suphurets' the
brief sketch Of the mode of procedure in bt the
extraction Of gold may not De odr Oh pic cars and
dumped on the grizzlies. That part which passes
through the bars goes straight 10 me II IL re-
duced 10 pieces the size Of walnut and that aisS
n,o tine minute Of Of an inch
has capacity of three tons an hour; %! USE, ,he
pre- of he stamp is increased 20
nsr cent The self-feeders are hoppers or wooden
pointed boxes placed above the Gs'eTy am" are en
abled to discharge constant and regular Supp!
OF ore 10 the battery mortar THIS supply 1 rh
stamp battery itself consists of an oblong
lar box constituting the mortar in which pa! d
number of huge pestles stamps. GenerdiN tneVe
are Ave stamps in each mortar, and this combina-
ton is known as a stamp battery i, he'o - ne
longitudinal opening along one OF the SIDES OF 'hs
battery. which is covered with screen, anu ~
through this the pulyer.zed rock is carried on 10
he mates bv a stream OF water. The bottom OF
ne mortar is atted with steel dies which receive
the weight Of the STAMPS Ea ,h s'I hnad or box
which is attached 70 an iron stem no or aPpe
stamps, which average about s3O poun9s a M are
Worked by means OF cams attached TO horizontal
cam shaft The Gamf has are an 10 independen a
Water is supplied 10 the battery. the quantity
varying with the character Of the ore me ,, WSiTr
forms a wet pulp with the ore. ana TINS pup; oE
he Impact of the stamps Is dashed in all drec;;
lions Some is thrown against me amaigahmatSS1
the contained gold becomes attached to the plates
some Of the gold amalgamates win me merculEE
rhe screens and flows on the apron Of amaga-
mated copper plates placed IN 'front.' OF tne hattn.-
ness of the pulp depends the amount Of sulphur
cts contained in the ore Great care Is @
has shown that they are most efficient after they
have been used for some time and have acquired
the pulp passes over the concentrates, where the
f1ne suphurets are saved for subsequent treat
rs,or the e a dr9e of he mercury and the poney
residue Of gold melted into a bar. III,
Is The fsc 9ist Of at sGf per P stamp o IN
stamp mill this would include chlorinaiion works;
a ten-starp mill requires six miners inches OF
water and the power required lie thirty morse
The cost Of milling varies at dneTe d h fnSes
for obtaining good water supply being important
considerations. At the Providence mine IN ca an
forna the cost of milling is only % cents per t0n'
but this is an exceptional case.
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