MSHA - Code of Federal Regulations - 30 CFR 57.9360
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MSHA - Title 30 CFR
30 CFR § 57.9360
Shelter holes.

(a) Shelter holes shall be

(1) Provided at intervals adequate to assure the safety of persons along underground haulageways where continuous clearance of at least 30 inches cannot be maintained from the farthest projection of moving equipment on at least one side of the haulageway; and

(2) At least four feet wide, marked conspicuously, and provide a minimum 40-inch clearance from the farthest projection of moving equipment.

(b) Shelter holes shall not be used for storage unless a 40-inch clearance is maintained.