Demonstrated Reserve Base (DRB) for an historical and active mining field in the Piceance Basin. Includes: factors in determining coal resource quantities; categories of coal rank, mining, reliability, and coal thickness; depth of coal; depletion adjustments, coal quality characterizations; coal accessibility adjustments; recovery rates; calculations of coal tonnages. 20 pages. 4 figures. 5 tables. Appendices. Digital PDF download. OF-98-05D
From the authors notes:
The Coal Reserves Data Base (CRDB) program is a cooperative data base development program sponsored by the Energy Information Administration (EIA). The objective of the CRDB program is to involve knowledgable coal reserves data. The Colorado Geological Survey (CGS) entered into Cooperative Agreement DE-FC01-96EI29138 with the U.S. Department of Energy, Energy Information Administration, to update coal resource estimates for the Somerset coal field. The 18-month project began in October 1996.