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alloys alumina amount analyses anhydrite approximately Athabaska river band barrels beds bentonite bituminous sand Brass calcite calcium Canada Canadian cement rock cent chemical Clearwater river coil dried colloidal clay colour commercial Company composition containing copper cost creek deposits Dept diatomite distillation dolomite drilling east exposed feet fine-grained Firebag Firebag river formation grade helium high-calcium limestone important impure inches indicated industry Kirschbraun LaBine point Laboratories lake lime limestone magnesian Magnesium carbonate Manitoba manufacture material mesh miles mineral Mines Branch moulding sands Muskeg natural gas obtained occur Ontario operations Ottawa outcrops overburden oxide pegmatite petroleum pitchblende pitchblende vein plant Plate pounds present production Provinces quarry quartz Quebec radium railway refineries refining Rept rock wool Run Xo samples shale silica silver stone supply surface Temiscamingue sand tests thickness tons Total township uraninite uranium width wire