The Alaska citizen., 1911-09-04
First Custom Mill
in Ianana Valley

have their mled in quantities afforded
when the Cinema Milling Smelling and Refining
company built its ten.stamp mill at Cinema. This
first placed in operation on November l,
1910. and since that time some most excellent re-
suits have been obtained from it. The mill is
splendidly equipped in the most up-to-date manner
and all who have examined it are much impressed
with its efficiency.
The ores that come to the mill in the
the spur # the Tanana Valley railroad built for
the purp Sc. are unloaded the floor of a storage
she'd Is feet vide. and 30 feet long A sampling
floor is Installed in this shed which the pre-
liminary sampling OF the ore is made. The sample
reduced this floor, according to the size of the
shipment, to a few hundred pounds for small
shipments or several tens for larger shipments.
This sampling is done by the Cornish method of
coming and quartering After being reduced this
flor the sample is put through the crusher and
taken to the sampng room in the assay office,
where it is further reduced to the final assay
pie. This sampling room is equipped with
small crusher disc pulyerizer and iron sampling
floor and a small sampling machine.
The assay office is completely equipped with
all the necessary apparatus and supplies for both
fire and assays.
The ore as required is hoisted from storage
shed and dumped on the grizzly. The fines go
through the grizzly direct to the bin and the
size goes to the crusher floor, from which if is
shoyeled into 10xl2 jaw crusher, of the Blake
type. The capacity of this crusher is 100 tons in
"a hours. From the bin the falls into chues
leading to the automatic Challenge feeders of the
suspended type. These feeders feed the
the stamps required. The pulp it
from the battery flows over two apron plates, hav-
ing a drop OF two inches between them. The
plates heavily silyered i'll order to eliminate
the loss Of gold by absorption, that no dispute
arise would be possible if plain copper
plates were used. On rich ores inside chuck
block plates and splash plates used. The
slope of the plate tables be adjusted give
the best conditions for each The pulp from
the plates falls into a trough which contains
other copper plate. This trough acts first
amalgam trap. From the trough it flows to
standard California amalgam traps and from them
it goes to the cassifer
The classifier is the Colorado Iron Works double
type The spigot product goes the sand
table, taking with it any amalgam which may
have escaped the traps. This is caught on
copper plate in the feed box of the table. The
overflow goes to a Callow tank where it is
thickened the proper consistency for the slime
tables to do their best work
From the tables the concentrates flow into
large settling trough where all but the very finest
shines saved The overflow from this trough
charge from which will be clear 1t is
practically impossible for any concentrates to
escape The taings from the tables go into a
failing launder which discharges into the mill tail
If it is found that the talings still carry
values few cents they impounded and
saved for future treatment
The mill can at any time be converted to a
concentrating mill, if any concentrating
should be offered Dester concentrators used
there being large slime tables and sand
table.
The mill has thoroughly equipped laboratory
with all the necessary apparatus for experimental
work determine the best methods Of treatment
of any that may be offered.
The water supply is drawn from a we'll in the
building itself, from which it is pumped to tank
above the battery floor. The water is heated in
this tank by means of coils of pipe The
building is thoroughly heated throughout with the
exhaust from the two engines and there is
absolutely danger Of the mill being obliged
to shut down account Of cold weather.
Two boilers, each of As horsepower have been in