Bonners Ferry herald. [volume] (Bonners Ferry, Idaho) 1904-current, 1921-05-26
gregates $500 feet.
Heavy Yardage Expected.

AT the time the writer visited the
property the pit was perhaps 500 feet
wide at its highest dimension and was
being worked down towards bedrock
by the two upper giants. The lower
giant was working upon the debris
washed down from above, near where
the hydraulic race enters the main
creek 1t is impossible to estimate
closely how much ground was being
moved under these conditions, but plac-
ing the average at generou maximum
OF 10 cubic yards per day to the min
er's inch of water used, it is possible
that it reached around 10000 cubic
yards daily. The management figures
upon minimum of $4,000 yards daily
when the plant is in full working order
but to attain that figure the ditch may
need some attention. The pitch of the
bar is very steep and the dump per-
petually self-cleaning
Flume 300 Feet Long.
In February, 1920, the second big
part of the undertaking was started
3OO-foot bedrock flume, over which
the entire volume of Boulder creek was
to be diverted. The site is 1000 feet
below the present hydraulic race and
at point where the stream, passing
through rib of solid rock, commences
series of cascades and falls aggre-
eating a descent of 400 feet in the
first 800 feet and about 500 feet in
the l a miles traversed to the Kootenai
river.
Construction Most Substantial.
The aperture in the rock through
which the stream pours is As feet wide
at the throat and at this point the
cement piers and head gates have
been erected. Back of the cement
work, or down stream, log cribbing
was built up from bedrock over an
average width of SO feet, each log
being drift-bolted and cemented. The
logs at the headgate end are 20 feet
long, feet in diameter and set feet
in cement. Over this understructure
the bedrock fumes and spillway were
contradictions flume feet wide
and feet deep; the second or mid
ole flume, IL feet wide and s feet
deep and the spillway, nearest the
east bank, also ~ feet wide and s
teet deep. Footways three feet wide
run between the different sections.
1919 DNHttf.
The fumes are lined with 9O-lb.
steel rails. and two-inch angel iron
placed crossways, interlocked and set
in cement, thus forming what is be-
lleved to be impregnable resistance to
the heavy forces to which they will be
SUBJECTED. Between the steel lining
and 3-32-inch grizzly, is an under
current channel launders, set II feet
apart, into a $4,000 cement storage
bin, cut out of solid rock on the west
bank This grizzly is 1872 feet dong.
Then comes a grizzly set at u inch
and another, the last section, set at l
inch. The last two sections of the
fumes are fitted with Hungarian riff /
lies inches high, underneath which
are 4-inch undercurrent channels. The
coarse gold and rubies Cor garnets) of
which the gravel contains myriads |
Will be caught in the second and third |
grizzlies and drawn off as in the first I
section, through launders set IL feet
apart
This work, costing approximately
'15O.OOO, was completed early in April I
92l, when water was turned into both 1.
Tunes.
High Line Tramway Built
This is as far as actual construction
las gone to this date, the third stage |,
# development being the concentrat-
ng plant, which is to be built on top
4 the flume, extending its full length
I 800 feet. 1t might be mentioned that
o facilitate delivery of over 1000 4,
ogs. cement and other material used
n construction Of the flume, high /
inc was carried over the site from {
oint on the main road from Lenia, I
90 feet above the plant, to anchors on