30 CFR § 56.3430
Activity between machinery or equipment and the highwall or bank.
Persons shall not work or travel between machinery or equipment and the
highwall or bank where the machinery or equipment may hinder escape from
falls or slides of the highwall or bank. Travel is permitted when necessary
for persons to dismount.
Subpart C--Fire Prevention and Control
AUTHORITY: § 101, Federal Mine Safety
and Health Act of 1977, Pub. L. 91-173, as amended by Pub. L. 95-164, 91
Stat. 1291 (30 U.S.C. 811).
For further information: See MSHA's Program Policy Manual