IS-01 Coal Mines and Coal Fields of Colorado Download Publication Details This state-wide map identifies both surface and underground as well as active and abandoned coal mines along with a delineation of coal-bearing regions. Some data compiled from a prior CGS publication Bulletin-34A Bibliography, Coal Resources in Colorado, authored by R. D. Holt, and published in 1972. Digital PDF download. IS-01D Citations Jones, D. C. “IS-01 Coal Mines and Coal Fields of Colorado.” Coal Resources, 1:500,000. Information Series. Denver, CO: Colorado Geological Survey, Department of Natural Resources, 1976. https://doi.org/10.58783/cgs.is01.rxre4123. CGS Publications. https://coloradogeologicalsurvey.org/publications/coal-mines-fields-colorado/.