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_e_e_ allanite amphibolite average Bear Lake Beaverlodge Beaverlodge Lake biotite bluff Canada Canadian Canadian Shield carbonate cent chalcopyrite clay Coarse concession consists contain cu.yds Department of Mines diabase diabase dyke diamond drilling discovery drumlin east Edwardsburgh township Eldorado company euxenite explored exposed feet wide feldspar flank fractures Geiger counter Geol Geological Survey gneiss gold Goldfields grab samples granite granite-gneiss granitic rocks hematite Lake Athabasca Lake occurrence length mafic mafic rocks map-area Marine Northwest material miles Mines Branch Mines Ltd molybdenite northeast pegmatite pegmatite deposit pitchblende pitchblende deposits prospecting prospectors Proterozoic pyrite quartz quartzite radioactive minerals radioactive occurrences region reported ridge River sample sent sample showed samples taken sand sedimentary shear zone stringers surface terrace thorium township trenching types underlain uraninite Uranium Mines Limited visible pitchblende width Yellowknife