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Federal and Provincial Emission and Ambient Air legislation
is discussed as applicable to the Cassiar operations. To date,
no asbestos emission standard exists in Canada,

Cassiar emissions, both fugitive and point source type, are
estimated and discussed for the years 1970 to 1976. The major
pollutant is of the particulate variety, net tons per year of
point source dusts decreasing as control equipment is installed
and net tons per year of fugitive dusts increasing with mining
tonnage.

Insofar as % emissions to tons mined is concerned, a six
fold decrease is expected by 1976 compared to 1970 values, that
is from 0.29% to 0.05%, Certain installations already planned
or under construction at Cassiar make these objectives possible,
By 1976, it is anticipated that the large portion (almost 88%)
of total dust losses will be from uncontrolled sources (open
dumps at the mine) that may be considered normal to any open
pit mining operation, Losses to atmosphere from material trans-
portation to the Millsite are not considered significant enough
to warrant stringent control measures.

Source emission controls will have been installed where
feasible by 1976 and are expected to meet or exceed provincial

standards at such areas.

A discussion of monitoring results from Cassiar is provided.