ANCILLARY EQUIPMENT

Other equipment at the mine includes Ingersoll-Rand stationary
and portable compressors, which furnish air for Crawl-ir drills, and
TD—25 bulldozers which are used in road work, to prepare grades at
shovels and to assist in general mining operations. A 12—E grader and a
Tournatractor are available to keep roads in good condition, which is an
important factor in keeping down transportation costs. A garage at the
mine is used to service and provide running repairs on this equipment,
while major checks and repairs are done at the plantsite garage.

PRIMARY CONCENTRATION

Ore is transported from ore benches by truck to the jaw crusher,
where it is crushed to minus five inches. From the crusher, ore is con-
veyed to a rock rejection or pre-concentration circuit consisting of 2
cone crushers, 4 screens and a rotary drier. By rejecting 25 — 30% of
barren serpentine a comparably larger amount of fibre can be delivered
to the mill.

TRAMLINE

The tramline, manufactured and installed by British Ropeways
Engineering Co. Ltd., was started in operation in the spring of 1956. Its
total length, consisting of two sections, from the upper loading terminal
at elevation 5,800 feet to the lower station at elevation 3,525 feet is
14,600 feet. A third, or dumping section, near the mill provides a sub-
stantial outside storage area. The maximum capacity of the tramline is
2,200 tons per day but in practice an average of 1,800 tons is achieved.
There are about one hundred and eighty 18 cubic foot buckets on the
line which carry nearly % tons net weight. The tramline develops about
75 kilowatts while in operation. Tramline ore may be dropped directly
into a hopper at the mill, or if necessary dumped on an outside stock-
pile that can be built up to about 70,000 tons. This stockpile is reciaim-
ed by shovel and trucked to the mill. The ore to the mill is then screen-
ed, dried and stored in an 80,000 ton dry rock storage. This storage
allows the blending of ore for grade and moisture uniformity, while also
providing selected piles of ore for specific mill runs.