Bonners Ferry herald. [volume] (Bonners Ferry, Idaho) 1904-current, 1922-02-02
storage tank on the west side of the
flume, excavated from solid rock.
Three Sets of Grizzlies

storage tank ON the west side of tn,
Three Sets of Grizzlies
After leaving the 1882 grizzlies, tn,
material passes over 10S lineal fee
of II Inch grizzlies, with Hungarian
rifles, set 3 inches apart, beneath
Below the rifles is a 6-inch under
current space, with draw-off valves
IL feet apart, conducting the savet
material into a seperate tank, also OF
the west side of the flume.
After leaving the 1a-inch grizzlies
the material passes over IL feet o.
one-inch grizzlies, with Hungarian
rifles, set 3 inches apart, beneath
and 6-inch undercurrent space below
that. The draw-off valves from tn,
two latter classifications lead into {
wooden tank just underneath, inclined
from each end to depression in the
center, both classifications going from
the wooden tank to the same cement
bin.
Use Hydraulic Elevator.
From the first cement tank. holdins
the fine grey sands, black sands ant
fine gold, material is taken by nv.
NttFobOlS LhC lOWtI part Ol
which Is already set and connected tc
the pressure pipes, to the upper enc
OF the plant, where it is stored in
lOx30-foot steel tank and fed by
gravity to the washing plant, going
over battery Of 20 Ogden Modern
tables, where the worthless grey sand
is washed from the black sand and
fine gold and the latter passed on tc
patent gravity battles designed by AS
sistant Manager Deardoff and in
which the fine gold is taken from the
black sands and the latter sent on to
storage to the west of and at the lower
end of the flume structure
Bucket Elevator for Coarse Gravel.
The coarser gravel, containing the
coarser gold and garnets, caught in
the two last sections of the flume
is elevated by water-driven bucket
elevator to a height of 80 feet and
brought back to the head of the plant
by launder. 1t then passes over gray
ity battles of the Deardoff type, where
the coarse gold and garnets are ex-
tracted from the worthless material
The latter then goes to another set OF
battles, where the coarse gold is taken
off through draw-off valves and the
garnets sent on to hydraulic CLASH
fiers, also invented by Deardoff
These classifiers are eight in number
grading the garnets into as many
sizes
Flume in Three Sections.
AS already mentioned, the flume
consists of a 6-foot section, 8 feet
high; 12-foot section, 8 feet high
and 12-foot spillway, also 8 feet
high. Between these sections are
3-foot runways, so that each NAV be
reached without difficulty in case OF
trouble of any kind, water being shut
off by headgates.
Channel Iron and Steel Rails.
The 12-foot section of the flume was
being strengthened during my visit
Originally it was equipped with 6-inct
angle iron grizzlies, but when the
water went down last fall it was found
that the heavy boulders had badly
battered the edges, Consequently, il
was decided to substitute channel iron
II inches wide and about "a inch
thick. Over these grizzlies will be
placed 90-pound steel rails, laid
lengthwise, 3 inches apart at bottom
The six-foot flume has already beer
equipped in this manner and appears
to be standing the strain without diff.
ficulty The angle iron originally
used in the 12-foot flume was bought
from Hydraulic Supply Co., of Seattle
which claimed that Alaska operators
got from to years service under
ordinary conditions. The fact that
the iron lasted less than five months
during which the flume was probably
not used to capacity more than a few
weeks, will give some idea of the
force of the stream at high stages.
Must Resist Great Force.
At the upstream end, construction of
the flume is most interesting. For the
first 12-feet from bedrock is whole-loe
crib work, with 4-foot centers, filled
in solidly with cement. Upon this I'M
derstructure are built cement piers
bolted to it and built up IL feet. Up
right logs are set in these piers to a
depth of II feet. Buffer piers Of up
right whole logs have recently been
set in front of the cement piers to
take some of the impact of boulders
that approach the fumes at an angle.
These logs are protected by 8-foot
lengths Of 70-pound Steel placed up
right closely around the logs and held
in place by rings, made of 70-pound
steel rails. The latter are movable,
thus distributing the wear around the
entire ring and giving boulders a
chance to work eff through the flume.
The steel rings are carried up to the
full 8-foot lengths of the upright steel
rails, I'd rings being required for each
log and logs being equipped. Inside
the flume, new log lining is being laid,