MSHA - Code of Federal Regulations - 30 CFR 57.20003
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MSHA - Title 30 CFR
30 CFR § 57.20003
Housekeeping.
At all mining operations--

(a) Workplaces, passageways, storerooms, and service rooms shall be kept clean and orderly;
(b) The floor of every workplace shall be maintained in a clean and, so far as possible, dry condition. Where wet processes are used, drainage shall be maintained, and false floors, platforms, mats, or other dry standing places shall be provided where practicable; and
(c) Every floor, working place, and passageway shall be kept free from protruding nails, splinters, holes, or loose boards, as practicable.