30 CFR 721.12: Right of entry.

(a) Authorized representatives of the Secretary, without advance notice and upon presentation of appropriate credentials and without a search warrant, shall have the right of entry to, upon, or through any surface coal mining and reclamation operations or any premises in which any records required to be maintained are located.

(b) The authorized representatives may at reasonable times, and without delay, have access to and copy any records, and inspect any monitoring equipment or method of operation required under this Act, the regulations or the permit.