['Specialized Industries']

['Mining']

07/19/2025

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§33.31 Test space.

...

§33.31 Test space.

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

(a) Drilling tests shall be conducted in a test space formed by two curtains suspended across a mine opening in such a manner that the volume of the test space shall be approximately 2,000 cubic feet.

(b) No mechanical ventilation shall be provided in the test space during a drilling test, except such air movement as may be induced by operation of drilling- or dust-collecting equipment.

['Specialized Industries']

['Mining']

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