List of mines and selected coal analyses of mines and core holes in the Denver and Cheyenne Basins. 104 pages. 1 plate (1:250,000). Digital PDF download. OF-78-09D
From the Introduction:
This report contains data on coal mines and coal analyses of the Denver and Cheyenne Basins available as of June 22, 1978. There are 320 mines known to have operated in these basins. This is one of three reports resulting from the first year of a two and ½ year investigation of the environmental impact of energy resource development. The other reports include CGS Open-file report OF-78-08 and CGS Resource Series RS-05.