Amends the definitions section (30 U.S.C. 351) by revising multiple numbered definition paragraphs, replacing the text for the definitions of oil, lease, mineral leasing laws, Secretary, acquired lands/lands acquired by the United States, and United States; reorders paragraphs; and inserts a new paragraph defining 'hardrock mineral' with specified inclusions and exclusions (including an explicit exclusion for mineral materials subject to disposition under the Act of July 31, 1947 (Materials Act of 1947) (30 U.S.C. 601 et seq.)).

Amends the first sentence of 30 U.S.C. 352 by modifying the list of deposits subject to lease to include 'hardrock minerals' (striking 'and sulfur' and inserting 'sulfur, and hardrock minerals').