premise: Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled , That the Secretary of the Interior is hereby authorized and directed to establish and maintain a program of stabilization payments to small domestic producers of <mask> and zinc ores and concentrates in order to stabilize the mining of <mask> and zinc by small domestic producers on public , Indian , and other lands as provided in this Act .
hypothesis: the proper context for <mask> here should be a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey