OF-76-01 Active/Licensed Coal Mines of Colorado Download Publication Details This first (March 1976) publication by the CGS of active/licensed coal fields in Colorado shows the outline of coal-bearing regions with mine entrances and surface/strip mine pit locations. Also provided are the coal region name with original in-place resources to 6,000 feet depth. Listed are the mine name, coal-bearing bed formation, thickness, rank, number of employees as of December 1975, the average daily production in 1975, and the total 1975 production. 1 plate (1:500,000?). Digital PDF download. OF-76-01D Citations Jones, David C. “OF-76-01 Active/Licensed Coal Mines of Colorado.” Coal Mines, 1:500,000. Open File Reports. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 1976. https://doi.org/10.58783/cgs.of7601.ddsk1437. CGS Publications. https://coloradogeologicalsurvey.org/publications/active-licensed-coal-mines-colorado/.