['Specialized Industries']

['Mining']

07/19/2025

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§57.22220 Air passing unsealed areas (I-A, II-A, III, and V-A mines).

...

§57.22220 Air passing unsealed areas (I-A, II-A, III, and V-A mines).

RegSense CFR Regulations Mining Specialized Industries CFR Section English Focus Area USA

Air that has passed by or through unsealed abandoned or unsealed inactive areas and contains 0.25 percent or more methane shall—

(a) Be coursed directly to a return airway;

(b) Be tested daily for methane by a competent person; and

['Specialized Industries']

['Mining']

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