Mont. Code § 90-6-401
The commencement of new large-scale hard-rock mineral developments often results in revenue disparities among adjacent local government units. This occurs primarily when a mine that locates in one taxing jurisdiction causes population influxes in neighboring jurisdictions. The result can be that some jurisdictions will experience a need to increase expenditures and receive no corresponding increase in revenue, while others will experience an increase in revenue and receive no comparable increase in expenditures. There is therefore a need to allocate the increase in property tax base resulting from the development and operation of new large-scale mines so that property tax revenues will be equitably distributed among affected local government units.
§ 90-6-401, MCA