The Sumpter miner. [volume] (Sumpter, Or.) 1899-1905, 1900-07-25
SAMPLES AND ASSAYS.
Some Practical Suggestions on
These Points.

IN IWfHS' b''h''N Ii'u VNVVNi'l S'VNN
on the necessity Of sampling. viii pref.
ace my shor, article bv quoting from the
highest authority on same.
"Accura,r sampling is quite as essential
aS accurate asSaving, tor II the sample
does no; truly represent the lot. ~ mass,
from which II was taken, the subsequent
assiy> viii br valuelrss. The assavrr
or chrmis, viii usnally receive the samples
ALREADY prepared, but ~ hc will occasion.
ally br called upon - take his own
sample, knowledge OF the ar, oi samp.
Iing i essential"
ln the Northwest, the majority oi sam.
pies brought 10 IN as>ayrr are taken hy
the proSprC'or, ~ other interested party,
and u. the assay Crrtlii,atrs are often
used aS documentary evidence oi the
value oi the property, the a>>aver should
h- very careful 10 state on the face ot
such Scr,in,atrS exactly from whence he
obtained the sample on whi,h the assay
was made.
II ~ a>savrr samples the ore himself,
hc owes II ,o his Glen, - 10 STATE, rs II
doubles the value oi the certificate. " he
did not take the sample himself hr should
place the responsibility o' the sample
where It belongs, hv stating who did take
II. Wnhou, someone known vouching
iot the ore oi the sample, ASSAY crrtii'.
Gates should carry ~ weight a> do,u.
m-n,>. This can hes, br accomplished
by the a>>ayrr seeing 10 It that his print.
ed ,~s,ih.atr blank Is worded 10 cover the
desired points, telling the whole story and
protecting him from any after talk.
must protest, also, against the habit
oi certain a>savrrs IN iilling IN the value
Of the ore on the assay certificate, rs they
10, ~ the price ot the metal IN marketable
shape delivered IN New York. ], shows
4 gross ignorance on the par, Of the rs.
>ayet ~ to the value ot the ore here, and
often mi>lrad> the prospcct"r iriphttully,
y, the same time iurthssing and opening
the door tor fraudulent practice. have
seen. this summer, ASSAY certificates upon
which the copper NJ & per cent ore was
figured ont At ~ cents. equal 10 SiS per
ton, whereas no >mrltrr could afford to
pay more than about one.thiri that price.
4 good, practical rule To use IN figuring
out approximate values oi 4 >ulphldr ore,
At present market quotations, is as iol'
lows:
ALLOW S,.,S Tor every per cent oi cop
per the ore contains.
Allow 20 cents ior every per cent nj
lead the orr contains.
Allow So cents Tor every ounce ut >il.
vrI the ore ,ont1lp>.
Allow 5000 iof every ounce oi gold
the ole contains,
These values ,tr ior ore delivered on
the line oi railway,
The ptospr,tor has to sample his own
,iaim aud wishes To know the truth. Nat
uraily, | ask how hr i To do IL. and the
following remarks ~. tor his benefit. not
tor the professionals
IN >amplinp a lead, Il the vein i> ~
that II will all have ~ 20 Tor treatment, a I
section al uniform thickness righ, across
the whole iatr oi the lead should he taken .
tor otr samples.
Another, and quite a> satisfactory a .
method. il 10 sample all the rock that .
comes ou, oi the prospect. or sample the
dump. II there is any, Nv ,uttlng chan.
neis through il. on the same principle aS
In slmpllny A ledge,