CFR
- Title 1 - General Provisions
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- Title 3 - The President
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- Title 50 - Wildlife and Fisheries
57.22607—Blasting on shift (III mines).
When blasting on shift, tests for methane shall be made in the mine atmosphere by a competent person before blasting. Blasting shall not be done when 1.0 percent or more methane is present.
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