1. Pursuant to subparagraph d of the first paragraph of section 18 of the Mining Tax Act (chapter I-0.4) the costs entailed by the following works may be deducted as an investment allowance:(a) diamond drilling carried out on the site of an underground mining operation with the exception of the works mentioned in section 2;
(b) geological and geophysical works carried out on the mining site; and
(c) drifting works, with a face surface area not exceeding 20 m2, carried out to explore a target region, provided that the latter is at least 150 m away from any underground opening and at least 200 m from the surface.