30 CFR § 75.1319
Weight of explosives permitted in boreholes in bituminous and lignite mines
July 29, 2020
(a) The total weight of explosives loaded in any borehole in bituminous and lignite mines shall not exceed 3 pounds except when blasting solid rock in its natural deposit.
(b) The total weight of explosives loaded in a borehole less than 6 feet deep in bituminous and lignite mines shall be reduced by 1⁄2 pound for each foot of borehole less than 6 feet.
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