MSHA - Code of Federal Regulations - 30 CFR 57.11052
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MSHA - Title 30 CFR
30 CFR § 57.11052
Refuge areas.
Refuge areas shall be--

(a) Of fire-resistant construction, preferably in untimbered areas of the mine;
(b) Large enough to accommodate readily the normal number of persons in the particular area of the mine;
(c) Constructed so they can be made gastight; and
(d) Provided with compressed air lines, waterlines, suitable handtools, and stopping materials.