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34 air changes baghouse-type collectors Bureau of Mines Canada Centre Cecala Centre for Mineral cfm of ventilation changes per hour concentration recorded CONCENTRATIONS AT MINERAL contaminant cubic foot days of testing design criteria determine dust monitoring locations east and west east fan entire mill equipment exhaust fans exhaust ventilation system Figure five monitoring locations four fans operating gas was released gravimetric and RAM-1 Gravimetric RAM-1 Gravimetric gravimetric samplers inside the mill Klinowski locations at mill mill dust levels mill ventilation system MINERAL PROCESSING FACILITIES mineral processing operations minor dust sources north fan Nova Scotia plant prevailing wind RAM-1 Gravimetric RAM-1 RAM-1 instruments RAM-1 results RAM-l's REDUCING RESPIRABLE DUST reduction in respirable respirable dust concentrations respirable dust levels SAMPLE LOCATION tests were performed Thimons throughout the mill tilation system total mill ventilation U.S. Bureau ventilation profile curve VENTILATION VOLUME wall louvers weeks of testing west fans windows were open