Mont. Code § 15-6-132 : TAXATION — PROPERTY SUBJECT TO TAXATION — CLASSIFICATION —6-132 - Class two property -- description -- taxable percentage TEXT PDF (1) Class two property includes the annual gross proceeds of metal mines. (2) Class two property is taxed at 3% of its annual gross proceeds, as defined in 15-23-801. § 15-6-132, MCA En. Sec. 2, Ch. 693, L. 1979; amd. Sec. 72, Ch. 11, Sp. L. June 1989.