130R67. A taxpayer may deduct as additional allowance in respect of property acquired for the purpose of gaining or producing income from more than one mine and for which a separate class is prescribed under section 130R170, an amount not exceeding the lesser of(a) the taxpayer’s income for the year from the mine, determined without reference to paragraph z.4 of section 87 of the Act and before any deduction under this section, section 130R69 or 130R69.2, section 145 of the Act, any of Divisions II, III, IV and IV.2 of Chapter X of Title VI of Book III of Part I of the Act or section 88.4 of the Act respecting the application of the Taxation Act (chapter I-4); and
(b) the undepreciated capital cost to the taxpayer of property of that class at the end of the taxation year, before any deduction under this division for the year.