25 CFR 227.20: Permission to start operations.

(a) No operations will be permitted on any lease before it is executed by the Secretary of the Interior.

(b) Written permission must be secured from the supervisor or his representative before any operations are started on the leased premises. After such permission is secured the operations must be in accordance with the operating regulations promulgated by the Secretary of the Interior. Copies of the regulations in this part may be secured from either the supervisor or the superintendent, and no operations should be attempted without a study of the operating regulations.