Gunnison news-champion., 1911-08-11

Nsse prsne@re ARD ieUgersis-re Ues~
the opersxsou II ass<IlssnG tis~ oss
sse Gosn9 90 Tnse ~se sscoaap-
l'snsd. ~ pses,ss-is ssss~o. ~ u.sA-
nns a sy~cssi eomps-sissa ~ssk wescn
10 hEe tk< se~~eL Thse cp&p~sssoa
s - cesay thai Il .; lsrs~d ssi dan
u ~ousd add boil . sussli sssss ~ The
eas;
Whsi 10 the co~fs To gave u ex-
act. one np,. hsse an aaslysss oi
each ore In aaa,;r,u ~ the co~s 81
reduction the cu-s ct recssesy ~
thi- proce~~ aey-sd. .ss,n the
anosni II acid regssr,d - as-soiVe
the ere. aud thai smospi aeyesd-
on the s.lI ksr cos,eut Of the ase
Generally speaking. b y tcosa
pres-or) wlsi recoeer o.e tsa II a,tr,c
scid s la2 sp~c.hc sravsay Cost
II 2 b D. ~ cents
One toa ei nitric acid wsll asesalve
over ? toes II 5 pei cea' sslphias
ore. l,~~ 1t ac,a Va recovery per
eert. or ~ lbs, winch 81 6 cen,- p.sr
posnd gives sc,d lore. ar es~t 81 2
toms : ~. plus b. y eo-' oi 80
cents eqasIs 81 MI. or 81 l6 per
taR. Understand, this cuss will ia
crease or dlnsnish with q 9res,er or
lesser percentage IT sslphar IA the
ore
The cost of precipststla9 the
metals from the s,lst,oa depends
upon the ssmber of metals IN the
solution. each aseta being precipstst-
ed separately and each requiring a
different preclp,tstIns agent. These
agents are common aud cueap For
Instance, common salt will precip,-
tate silver, and iron or hme precipi-
tates copper, etc, each adding bsi a
small item 10 the cost and giving
after drsssisR IN the laboratory, the
pure Metals ready for the market
Ii must he remeabesed that the
above estimate Of cost 10 given
generally, and that no accurate fgares
can he given without having a com-
plete analysis oi the ore.
From the foregoing it will appear
that the ststesaent II the inventor
that by his process he can recover
the ore valses ct fToo one tenth 10
one-half Of the smelter charge 10 not
too broad. With . plant st the
mine the operator not only con trest
his ore cheaper bot save freight,
penalizins. sorting, concentration,
concentrssion losses and loss OF metal
value because too low 10 receive
smelter credits.
Whea tvessinS ore low in sslphur
coutsst end eoasaiaine also oxides OF
carbontss, o. where if eli the sslphsr
is oxidissd, thew wosld not be ssf.
fciess sslphsric scid 70 form =
nsstsal s0lstioa of sslphsses, then,
4 ths onides o. csrboasses are not in
Gssss excess, ssficient salphsr in
- form of pyrite or sslphar'c scid
nay be added TO the ore charge il
~ former, and 10 the nitric acid il
sAe latter, TO form . neutral sulphste
s01stion. A pre-snalys,s Of the ore
Gill indicate the proper amount Of
sslpAur required 10 be added
When the oxides OF carbonates
80 in great excess, and reqaire =
psohibitive amount Of sulphur 10 be
sAded, Mr.. Rankin has a method
whch he terms a bi-carbonatina
nethod of treating the ore. This
1ethod the writer has not investi-
essed No large plant has been pro-
vided with this latter system 40 yet,
asd it's prscticability has not BET n
determined outside Of the laboratory
At this writing the result Of the
6rst and preliminary run of the so
ton plant just completed at Lake
City, Colo, shows the recovery OF
nitric acid used 10 be 93 6 per cent
and the metal recovered over 95 per
eent.
The writer, having spent several
months in the investigation OF this
process, in which he was assisted by
chemists and metallurgists OF
scAnowledged ability, has no besi-
fancy in stating that what amalga-
nation is 10 free-millihe ore, what
cyaridation 10 10 oxidized ore, the
Rankin process 10 TO sulphlde ores
tCaptain swarthout financed the right to tl,s
~ in "a he Lat Of tlftlfbFAtfl.1