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This document provides instructions and forms for filing the Metalliferous Mines License Tax return in Montana. It includes details on reporting mineral production quantities and values, calculating deductions and tax owed, and payment instructions. Licensees must report production data for minerals including copper, gold, lead, and silver on a semi-annual basis. Tax rates are applied to the merchantable value above $250,000 per year, ranging from 1.6-1.81%. Penalties apply for late or amended returns.