All metal mines must file a Statement of Gross Proceeds of Metal Mines.
MMG tax value is 3% of annual gross proceeds (15-23-801, MCA). Local mill levies apply to this value to determine the tax.
Tax Value X Mill Levies = Tax Owed
Gross proceeds are the payment or refined metal received by the mine from the metal trader, smelter, roaster, or refinery, multiplied by the quoted price minus allowed costs.
(Amount of Metal Received x Quoted Price) - Allowed Costs = Gross Proceeds
Mines producing less than 20,000 tons of ore in a year are exempt from property tax on half of the gross proceeds. (15-6-208, MCA)
Metal traders, smelters, roasters, and refineries specify the allowed costs in the contract. These costs may include:
You may also subtract the cost of shipping from the mine or mill to the smelter, roaster, or refinery.
File through our TransAction Portal (TAP).
Local county treasurers collect MMG Tax. Contact your county for more information.
County treasurers distribute the Metal Mines Gross Proceeds Tax to taxing jurisdictions based on their associated relative economic impact.
Hard-rock mining operations are subject to hard-rock mining impact property tax base sharing laws.