MSHA - Code of Federal Regulations - 30 CFR 75.501-1
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MSHA - Title 30 CFR
30 CFR § 75.501-1
Coal seams above the water table.

As used in §75.501, the phrase "coal seams above the water table" means coal seams in a mine which are located at an elevation above a river or the tributary of a river into which a local surface water system naturally drains.