Mont. Code Ann. § 15-37-103
(2) Concentrate shipped to a smelter, mill, or reduction work is taxed at the following rates:
Gross Value Rate of Tax of Product (percentage of gross value) subject to subsection (4), the first $250,000 0% more than $250,000 1.81% of the increment
(3) Gold, silver, or any platinum-group metal that is dore, bullion, matte, or another form of processed concentrate that is processed in a treatment facility owned or operated by the taxpayer and that is sold or shipped to a refinery for final processing is taxed at the following rates:
Gross Value Rate of Tax of Product (percentage of gross value) subject to subsection (4), the first $250,000 0% more than $250,000 1.6% of the increment
History: En. Sec. 4, Initiative No. 28, 1925; re-en. Sec. 2344.4, R.C.M. 1935; amd. Sec. 1, Ch. 220, L. 1957; amd. Sec. 1, Ch. 176, L. 1959; amd. Sec. 1, Ch. 9, Ex. L. 1969; amd. Sec. 1, Ch. 392, L. 1971; amd. Sec. 2, Ch. 126, L. 1975; amd. Sec. 5, Ch. 156, L. 1977; R.C.M. 1947, 84-2004; amd. Sec. 6, Ch. 619, L. 1983; amd. Sec. 3, Ch. 672, L. 1989; amd. Sec. 2, Ch. 19, Sp. L. August 2002; amd. Sec. 2, Ch. 342, L. 2003; amd. Sec. 1, Ch. 4, L. 2009.