Mont. Code § 15-23-504
The tax and penalty so assessed on net proceeds are a lien upon all of the right, title, and interest of such operator in or to such mine or mining claim and upon all of the right, title, and interest in or to the machinery, buildings, tools, and equipment used in operating the mine or mining claim. The tax and penalty on such net proceeds may be collected and the payment enforced by the seizure and sale of the personal property upon which the tax and penalty are a lien in the same manner as other personal property is seized and sold for delinquent taxes or by the sale of the mine and improvements, as provided for the sale of real property for delinquent taxes, or by the institution of a civil action for its collection in any court of competent jurisdiction. Resort to any one of the methods of enforcing collection shall not bar the right to resort to either or both of the other methods, but any two or all of the methods may be used until the full amount of such tax and penalty is collected.
§ 15-23-504, MCA