10.1.1. Subject to section 14, the amount that an operator may deduct, under subparagraph b of subparagraph 2 of the fourth paragraph of section 8, as a depreciation allowance in computing the operator’s annual earnings from a mine for a fiscal year in respect of class 4 property must not exceed the portion, reasonably attributable to the operation of the mine, of the lesser of1° the amount obtained by multiplying the undepreciated portion of the capital cost of property of that class at the end of that fiscal year before any deduction under that subparagraph b at the end of that fiscal year, by 30%; and
2° if the operator no longer owns property of that class at the end of the fiscal year, nil.
Despite the first paragraph, an operator shall not deduct an amount as a depreciation allowance in computing the operator’s annual earnings from a mine for a fiscal year in respect of class 4 property if the undepreciated portion of the capital cost of the operator’s class 1 property, class 2 property and class 3 property, at the end of the fiscal year, reduced by the amount the operator deducts in respect of such property, for that fiscal year, is greater than zero.