Memorandum Series, Issues 134-137 |
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acid adit alloys aluminum amounts Belgian Congo bituminous British Columbia Bureau of Mines Canada Canadian coals carbide carbon cent copper cent lead cent zinc Chemical columbite columbium columbium and tantalum Company Limited containing Department of Mines depth die-casting east exported feet ferrocolumbium Flin Flon flotation fuel furnace grade important impurities industry Investigation iron laboratory Lake lead and zinc levels located Manitoba manufacture metal miles mill minerals Mines Branch Report Mines Limited Mining and Smelting Nemegos Nigeria Niobium occurs Ontario operations orebody Ottawa ounces output pegmatites pentoxide pounds pyrite pyrochlore quartz quartzite Quebec refined zinc reserves River rocks sandstone shaft Short Tons silica silica deposits silica sand silver smelter Smelting Company sphalerite sulphide tantalite tantalum and columbium tests tons a day tons averaging tons tons Township tungsten U.S. Bureau United veins zinc concentrates zinc oxide zinc plant zinc sulphate zinc-lead zone