30 CFR 57.6960 - Mixing of explosive material.
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(a) The mixing of ingredients to produce explosive material shall not be conducted underground unless prior approval of the MSHA district manager is obtained. In granting or withholding approval, the district manager shall consider the potential hazards created by—
(4) Any other factor deemed relevant to the safety of miners potentially exposed to the hazards associated with the mixing of the bulk explosive material underground.
Title 30 published on 2014-07-01
no entries appear in the Federal Register after this date.