(a) subject to sections 16.14 and 16.15, 50% of the aggregate of all amounts each of which is expenses incurred by the operator after 27 March 2018 and before that time to carry out environmental studies in relation to a mining operation project, including those incurred before the exploration stage, but not includingi. expenses for environmental studies referred to in subparagraph a of subparagraph 1 of the second paragraph of section 16.9,
ii. an expense that may reasonably be considered to be attributable to a mine which has come into production in reasonable commercial quantities or to an actual or potential extension of such a mine, or
iii. fees payable under an Act or a regulation as rates, administrative costs, guarantees, compensatory measures or other fees of a similar nature, and