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Algoman anhydrite assay average band beds Brantford Brantford Lot Brick and tile calcined Caledonia Camillus Canada Canadian cent claims Clinton Cobalt Cobalt series conglomerate crosscut deposits diabase dikes dolomite drift drilled east feet feet feldspar Formation ft gabbro Gas consumption geological Gold Mines Goulais river Gowganda granite greenstone greywacke Guelph gypsum Hamilton inches intrusions iron formation Keewatin Kirkland Lake Lime and shale limestone Limited Lythmore magnetite Matabitchuan McDonald lake miles mill minerals Mississagi Natural Gas Niagara Nickel Nipissing Open flow operations ounces outcrop phenocrysts plant plaster Population Porcupine porphyry production pyrite quartz quartzite Red Medina Red shale rhyolite river Rock pressure salt sample sand and gravel schist sediments shaft shale shows silica silver stopes surface Thickness tons Toronto Total depth township vein White Medina width