The Coalville times. [volume] (Coalville, Utah) 1894-1923, 1899-10-06
BENEFITS OF coNcENTRATIoN
An Important nras,b ~ MetaiiurEy That
D. somftlfHs. n,,rt,ot.d.

An Important hfa,sh ~ MetaiiurEy Thai
d som'uuHss overlooked.
one NJ thc mos Important branches
10 the moihilufsipl hcld Of the min
lug industry n 'Nat OF concentration
ln many districts loo little attention I.
paid tn No. oi's a. shipped la bulk
or are ruirll lahufDrtcd aud the best
portion shlpprl ihp smclicrs az u
prphi. il is true. hm nt % greater cost
than would !" n'''ssnry " c0nccntrn.
ton 10y uccuhhl'"i means were first
employed The Srcobd arndr ores r..
main IN the dump inmnt, cases. prnc.
tcnll, waste though containing good
values IN SOME iiilhrs the ores are
$50 dissominaieh 'nipugh the gnugue
that hand -ofilh- 'h De- carried ON
rapidly aud er"i"ll',ally. but this Is
only The ease Nh'l' ne ore occurs In
considerable masses. Hand .orilnp il
mot economically prhrucnblr when the
mineral occurs 10 tue form of dissent.
untcd grains
Concentrating m1rliinefy De- dc.ipned
for street.-the purposes. hW Ina. consider.
able range NJ application. Most ores
nre easily concentrated a. low cost. Int
some complex ors. snch AZ those con.
tnlulny nn intimate miNiurr az pvrite
rnlrnn aud blcndr. anunl upsntisfnc.
iory results. Fortunately Tho latter
rinss of ores tlu not occur universally
tbnusb found iu large Quantity In so,ne
mining regions GENERALLY nIant
consisting NJ rock breakers rolls
irommcls. llgs aud concmtrntlns IN,
lilies buddlr4 or belt mncltnes nrn bot.
nor ndnptrd 10 concentrating orrs tbon
stntnp. and concentrating mnrl,ln, !
alone. for the reason that a large nor.
reutnep Of the mineral u obtained
In the first parts III the operntlnn Tho
p1rtIcle. heing comparatively cn,rso
The nnc material boing cnll'ctud la the
latter pnrt Of the process Stnmna
crush all portions so Tine ihni tho sub.
souurnt recovery Of the smallest pnr.
tlrlps. which IN some ores ctiishcd hy
STAMPS form the largest portion OF the
valuable mineral. becomes a nintter Of
great difficulty. Rolls create a more
Uniform product ~ they havr n tom
;rucy IN crack and not 10 Grind the
lre. and NJ most sulphldc minerals
break along the lines ~ their natural
cleavage when subjected 10 crushing
force. the small grains have angular
faces which seem Ia facilitate their
separation from the gnnguc. II IL the
alm Of the successful concentration TO
make ~ few shines rs possible
When ores high grade enough 10 ship
without sorting are concentrated by
machinery. the gangue, II containing
ynlues In gold and silver may be sepa-
rately treated subsequently by anal.
snmntion or some teaching prooss. If
they will not pay for this subsequent
manipulation they certainly WI not
pny the transportation and rebellion
charges when shipped to the emlter.
II Is mistake which many uners
make IN send poor ore with rich, sven
though the average be high for the
poor alone win not pay, II pays ndbet.
ter when mingled with the high-ade
ore. This Il u simple proposition wlch
seems to be- lost sight OF II the ddre
10 secure quantity. I'm shipping res
the aim should be- 20 get NJ high vhie
ms possible In ns small bulk M pol.
blc.-Mlnlng and Scientific Press.