CFR > Title 30 - Mineral Resources > CHAPTER VII—OFFICE OF SURFACE MINING RECLAMATION AND ENFORCEMENT, DEPARTMENT OF THE INTERIOR > SUBCHAPTER E—INDIAN LANDS PROGRAM (parts 750 to 756) > PART 750—REQUIREMENTS FOR SURFACE COAL MINING AND RECLAMATION OPERATIONS ON INDIAN LANDS > 750.21—Coal extraction incidental to the extraction of other minerals.