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Method Of Mining Corundum

placer claims of the American Gem Mining Syndicate. _____ 4.6 10. Coarsely crystalline corundum-bearing gneiss from the Elk Creek corundum deposit..----- 69 11. Corundum-bearing gneiss showing an abundance of coarsely crystalline aggregates of corundum and feldspar. _____ 70 12.

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