43 CFR 3601.51: How will BLM inspect my operation?

You must allow BLM access at any reasonable time:

(a) To inspect or investigate the mine condition;

(b) To conduct surveys;

(c) To estimate the volume, types, and composition of commodities that you mine or remove;

(d) To examine weight tickets, truck logs, and other records that BLM finds necessary to verify production; or

(e) To determine whether you comply with contract, permit, statutory, or regulatory requirements.