I. INTRODUCTION

This report summarizes information on emissions to
atmosphere at the Cassiar Mine in Northern British Columbia.
Certain process arrangements are currently being planned or
constructed which will @ffect emissions in future years.
Anticipated effects are outlined where possible based on the
best available information. No data is provided for effluents
to water or discharges onto land as they are outside the scope
of this report.

Discharges to atmosphere may be characterized in two
related ways - their source emission characteristics (i.e.
point sources quantity and relative concentration) or by their
effect on Ambient Air Quality (i.e. general tendency to dis-
perse over the area as a whole causing increase of pollutant
concentrations above normal background values.) Values for
ambient air quality are necessary to provide a measure of con-
trol where a fugitive dust problem exists and would not be a
stack emission. Most monitoring programs therefore take measure-
ments of both emission values and ambient air quality.

It should be noted that pollutant concentrations inside
working areas are not presently discussed. Emission standards
and ambient air quality proposals or legislation only pertain
to the outside environment.