Mining taxes paid by the taxpayer to the provinces of Ontario, Quebec and Newfoundland and Labrador were income taxes the deduction of which was prohibited by s. 18(1)(a) rather than taxes in the nature of royalties the deduction of which was prohibited by s. 18(1)(m) of the Act. (The latter characterization would have resulted in the deductibility of such taxes by virtue of s. 8(1) of the Income Tax Act (BC)).