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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 30 - Mineral Resources |
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Chapter I - Mine Safety and Health Administration, Department of Labor |
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SubChapter K - Metal and Nonmetal Mine Safety and Health |
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Part 57 - Safety and Health Standards - Underground Metal and Nonmetal Mines |
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Subpart T - Safety Standards for Methane in Metal and Nonmetal Mines |
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Ventilation |
§ 57.22241 - Advance face boreholes (I-C mines).
Latest version.
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§ 57.22241 Advance face boreholes (I-C mines).
(a) Boreholes shall be drilled at least 25 feet in advance of a face whenever the work place is within -
(1) 50 feet of a surveyed abandoned mine or abandoned workings which cannot be inspected; or
(2) 200 feet of an unsurveyed abandoned mine or abandoned workings which cannot be inspected.
(b) Boreholes shall be drilled in such a manner to insure that the advancing face will not accidently break into an abandoned mine or abandoned working.