26.1. The amount that an operator may deduct as an additional allowance for a northern mine in computing his annual profit for a particular fiscal year, under subparagraph j of paragraph 2 of section 8, shall not exceed the lesser of the following amounts:
(1) the operator’s annual profit, for the particular fiscal year, determined without reference to subparagraph j of paragraph 2 of section 8;
(2) the cumulative northern mine expenses at the end of the particular fiscal year.
Notwithstanding the first paragraph, where the particular fiscal year ends after the ninth fiscal year following the fiscal year during which the operator begins processing ore from the northern mine, the operator may not deduct any amount for the particular fiscal year under subparagraph j of paragraph 2 of section 8.