30 CFR § 75.1714 Availability of approved self-rescue devices; instruction in use and location. (a) Each operator shall make available to each miner who goes
underground, and to visitors authorized to enter the mine by the operator, an
approved self-rescue device or devices which is adequate to protect such
person for 1 hour or longer.
(b) Before any person authorized by the operator goes underground,
the operator shall instruct and train such person in accordance with
provisions set forth in 30 CFR part 48.