The Portland daily press., 1899-03-09
rns FIRs resr FOR oats.
How the Asssyers Determine tho value
of samples from Nav Mines.


(Frnm the ljenver 1imes
OF piece OF misunderstanding rock Is In
ter'sting. The ore is first pulverizsd In
" crusher or mortar it Is then quartered
: 7 split until sample is Obtained small
enough fer convenient handling. A
-".rlit" Is series Of troughs alternating
/ with series Of Sits equal In number and
t.,ze 10 tina troupbs. Half of the sample
. =, - -. 81, ,,u
'r'"'"o" ~ s"e ''""s"s e'e'y i"'
%" Is Ia'sed through the srHt' Inns
I ~ ore s IL repeated until the quaDtiJ' Is
/ :, ,,,,i.,,,, .sspcsa m. s.n,,Ia TINS
itained ~ spend upon pucxihs
! oafd," me: al plate fastened on fisni
! ,undn, ion. IL ia then reduced to poweer
,,,,u a. III. ,..,,,,,,,-, lit, a.
- ''"'"s WV" 'n"' """ 80
a heavy iron siedee with smooth convex
surfsca The sample Is usually pull verified
,rt,, a. .,us..s, thro,,rh 4. .i,,, ,,ash
y
OF sohetihes ev"n mn e'enty-" esh SIEVE
In this condition the ore IL called pulp.
The ASSAY er uses W. .hts which are pro !.
,.or,,o,oa 20 ,hs c,mm.,c,., ws,,b,s an
ca ,,.
ASS; y ION, consisting oil ~, 100 grams.
pres enting u ton Of ore. The suit OF
=, ,s..v 4. ~si,bad In ,p,Iiiyra,ps IL
hn assay S"n u 'ne pup IL use". e"o"
| millisram In the result represents an
| ounce If the precious metal to the ton.
Ir.,.,,, HE "a .ss.r IN, ~ rho mil, Ia
os""is nun @" "e". "" pp
ussd ana the result is tGen piuitipheu
| by two to get the number OF ounces TO
tn. Inn
-, ,o =, ,,. ,,, d, ~.,,h.d
AnnI assny you u TUE pu'p ~ Me.fn.u
csNIuny on .ne pu'p .1aies; ""u PSs , u,
= c'uo,uo; ntosno. VIZ" nuAi o nuH
1Wsists VI ca.uona.e Vi so", o.a '.,, anu
sn,enarRe' OF P.o'o.,ue y, ioou ~
uouI ~ auus. 10 popo -, W" 80
.snu e"ss =" .S sae ~. go, ca i.ao
uo nna '.o 10 49, I,,,,, ;,;'.ras
Roiena o'ee Ie9"e oly MN. 'nto
, C.ner ois ,,.s I.n ,,.,.;,,.'
,.se Eqa'fo .s'"ai s' gS,,
me pup anu .ne n"t ar 'no'1 nr
n'Asu nnS oose a,a ~ a. ~ ~
80. 80 o,,s,.,on sal,
os.,r a.sanlaso o.sr sae o.n."oI 'a ~.
!. '"e.o al AZ .ddoa frha ,rn,;his
VIZ lioa u"'t r.. -,.,.s -.
ieI, p,".' u ~ ILL Sna ta.. 80 VIII. q.
oeen neaeeu W , ". s,".
IN, ~. i". n, 49, ., ,,s
coi'e" ". ~ ~. 20 U.s. $3.50 ~"
enins Nv v" ~ " P.a.. wy I1s,,i,n
,,o,i w " 10 " ,,in.g
a. 5000. 80. .a...,.. - ,ho ,,.t 4. o.,
~ rsuuoo .uo oon, x n.s V, sne ~ 10 "
soils 40 s'Ts VIZ" nc, Sns a.s'om =" , .ns
rnc'pie mas eeaseu 'ne o"uo ,,n "'e pouie e,
, NV ne'a .nou "nu ~ 80
ne say is.1usn proken " aus ."au
nute Is iou"u nv ,ne uo' su m ~. vi .n1 . o,I
ihls iesu pue.on con.aiu n, on .ae Ho,u nnu
SILVER ~ 1"s o,e' Spe .ue go
sha siisehH oni eue 'e"u UT "u..J"
pIa' =" W =, I'M "i'u aver.
on m q. repaa.1u III "u
lug 's"u 's .pe"e' a"u p"i' U,
sorpeo to.o.,e. VIII "n, o'ppa nu'
substances "n,cn 'uas oe III ."e 1871 ,.
Nv the oons ASH, ra'ins smai , ser
nueson IN Tue oupG ;,, ~, INC ,''n, s,,,,rn
contain Lnuou si'H,, '"e ''a" nu',oh 20
niaoe" 'ne eupe. az - !.
uo'n .he sIHe, ou' ~" wei!
siver 10 tus ors, Mnown sua".. ~
pure siIser - aa9eu Ill; ~ Sn"I .nIf1 un' pe
n'nt eAees s''T .r. ~ o"o uus'u " -,
U"lnl.' !. W. - IL. So,
ore Una. the ou''o" ''"y oe oar'e' WIZ"
aolu. H., .. !, o,...,a or g..
-, ,ne sa,e, ou.r u'' - thaS ,,r,'d rv
, uu,.om un," :. =, az" r,,,,n an,, Ihe .c,S
~. n,'ie isius ~ ~ 49, 49,. ,,o,I ~,