Weekly Arizona journal-miner. [volume] (Prescott, Ariz.) 1903-1908, 1904-06-15

rock, which has been used to clean the
rolls and crushed only once after a
rich sample, assayed and found it to
contain anywhere from a trace to g
per ton in gold when the original
lime rock contained no gold; and
even after taking all reasonable pre-
cautions to clean the machinery, some
dust still remains to work out later.
While it taks so little rich dust to in
crease the values of precious metals of
small sample representing a large
lot of ore, for the same reason it
would be Impractical to reduce the
values perceptibly by adding foreign
material to the ore without being de-
tected on account of the bulk, color,
etc. In addition to the danger of
sailing by accumulated dust or soft
rich ore sticking to the machinery,
there is also danger of taking out an
uneven sample (unless the ore is very
f1ne) caused by the larger pieces of
ore striking together at the entrance
of the slot cup, or whatever it is, of
the automatic sampler, and rebound
ing but allowing the fine ore to pass
on to its proper place. This con-
tinued loss of coarser ore (the coarser
the greater the discrepancy causes
quite a variation in the sample by the
time it is completed. After describ-
ing my objections to automatic sam
pliers, l freely admit that hand sam
pling is expensive and you have to de-
pend upon the laborers being care
full about taking their sample shovels-
ful from exactly the same place they
take the rejected portion; and for this
reason l propose a compromise by TAX
ing out the first sample automatically
and then completing the sample by
hand labor where there Is only a
small portion to deal with in the
same way they do in Colorado, as de-
scribed To do this and take samples
of both coarse and fine ore az it comes
from the crusher in plain sight, eco
nomically and with as little danger of
sailing as there would be with shovel
sampling, have outlined the follow
ing system, which we intend to fol
low:
The ore. as it is received by carload
after being weighed, can be dumped
shoveled into a lOx2O Blake crusher;
from the crusher it drops into an or
diary ore car by which it is conveyed
over the ore bins or mixtures ready for
smelling; between this ore car or chute
from the crusher passes the buckets
of the sampler, so arranged as to time,
size and number that an average sam
pie of the coarse and fine is taken
anywhere from one twentieth to one
ffth as desired. The buckets are
large enough so that in passing under
the stream of ore they catch it all,
passing on around in a circle until
arriving over the sample car where
they are tripped completely over and
discharge their contents, again hight
ing themselves ready for another sam
pie. The buckets are made of steel,
one piece forming the bottom and
sides so as to prevent joints for the
ore to hang in and be easily cleaned.
These buckets are hung on the ends
of arms projecting from revolving
disc; either the buckets or the arms
cau be removed with little trouble.
This arrangement is simple and
strong in construction; can be in open
view, so that anyone can watch it,
and requires but little room between
the crusher and the car. Such a
would be suitable for taking
from headings between the
crusher and the stamps in mills, as
it wonld require but little care and
could be depended upon to take the
sample just as often as the mill men
desired. But the greatest advantage
this sampler has over others is the
of very coarse ore after the
first crushing, for which it was orig
inalIy intended, as all smelter men
the Objectionable features
of fine ore in the blast furnace, as
we'll as the extra expense required to
make it fine; and most of the auto
matte samplers are designed and only
suitable for taking accurate samples
out of finely crushed ore.