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Users of this map should consult copies of the large-scale mine maps in the Office of the Colorado State Coal Mine Inspection Group for exact outlines of mined-out areas. Areas affected by collapse over mined-out areas may be larger than limits of mine workings. Depth to mined coal increases generally from west to east and ranges from zero at the outcrop to as much as 500 feet. Boundaries of workings should be verified by drilling. Shafts and drifts are only approximately located, and some may not be shown.
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