George Sutherland, South Utah Mines Smelters v. Beaver County…
“ The Constitution, therefore, provides, not for disregarding value in the assessment of taxes upon mines, but for arriving at it in a special manner-that is, by a measurement proportioned to the net annual proceeds derived from the property. The value of property bears a relation to the income which it affords. If it be property whose production is uniform and of indefinite duration the capitalization of the net income derived from it at the going rate of interest, in the absence of a more certain method, will furnish a reasonable measure of the value. ”
