Rio Algom Mines Limited v. Minister of National Revenue, [1970] CTC 53, 70 DTC 6046 -- text
JUDSON, J. (concurred in by Fauteux, Abbott, Martland and Ritchie, JJ.) :—We are concerned in this appeal from a judg- ment of the Exchequer Court of Canada with the extent of the permissible deductions under the Income Tax Act for mining