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111. CASSIAR EMISSIONS & SOURCES

There are two basic types of emissions to atmosphere,
namely point sources and fugitive. Unfortunately, there is
no currently available accurate quantitative data for Cassiar
mainly because the analytical costs and labour/equipment
prerequisites have to date been rejected as unnecessary to
the operation. It is, however, anticipated that a complete
testing program will be required by the B.C. Pollution Con-
trol authorities within the next one to two years, parti-
cularly in view of the fact that asbestos has been classified
as a hazardous pollutant.

Although no absolute data is available, emission
estimates have been made based on known equipment performance
and coltection efficiency, as well as emission factor infor-
mation specific to the industry and as cited in available
literature. The majority of emission estimates are also
supported both directly and by inference from 1974 ambient
air measurements.

A brief outline of the emission source is provided
below, and estimates summarized in Tables 4 and 5.

ke MINESITE

Main emission sources are:

i) Drilling (inertial collection or water injection)

ii) Blasting (no dust control)
iii) Ore removal (trucks to Primary Crusher)

iv) Waste removal (trucks to open dumps)

v) Primary crushing/drying/concentration (minimal dust

control)

vi) Concentrator Reject Tailings (conveyor to open dump)

vii) Transportation of concentrate ore to millsite
(via open top trucks and traml ine)