Mineral treatment processes for percentage and depletion purposes : hearings before the Committee on Ways and Means, House of Representatives, Eighty-sixth Congress, first session, on the legislative proposal of the Treasury Department specifying the treatment processes which shall be considered mining for the purpose of computing percentage depletion in the case of mineral products, March 5-6, 9-11, 1959.

Considers Treas Dept proposal that, for tax purposes, mineral treatment processes shall be considered at same percentage depletion allowance as mining.