Memoir 25Strippable low-sulfur coal resources of the San Juan Basin in New Mexico and Colorado
Compiled and edited by J. W. Shomaker, E. C. Beaumont, and F. E. Kottlowski, 1971, reprinted 1976, 189 pp., 57 tables, 59 figs., 4 plates, 1 appendix, 1 index.
A study describing the amount, location, quality, and economic position of low-sulfur strippable coal in the San Juan Basin, northwest New Mexico and southwest Colorado. Study conducted by the New Mexico Bureau of Mines and Mineral Resources for the Air Pollution Control Office of the Environmental Protection Agency.
Articles included in this memoir are: Stratigraphic distribution of coal in San Juan Basin by E. C. Beaumont, Cortez Dakota area by J. W. Shomaker, Gallup Mesaverde field by R. C. Lease and J. W. Shomaker, Hogback Upper Menefee area by R. C. Lease, Toadlena Upper Meneffe area by R. C. Lease, Newcomb Upper Menefee area by J. W. Shomaker, Chaco Canyon Upper Menefee area by R. C. Lease, Chacra Mesa Menefee area by W. R. Speer, San Mateo Menefee area by W. H. Pierce and J. W. Shomaker, Standing Rock Cleary area by J. W. Shomaker, Zuni Mesaverde area by F. E. Kottlowski, Crownpoint Crevasse Canyon area by J. W. Shomaker, South Mount Taylor Crevasse Canyon area by F. E. Kottlowski and T. A. Parkhill, East Mount Taylor Crevasse Canyon area by F. E. Kottlowski, E. C. Beaumont, and T. A. Parkhill, Rio Puerco Mesaverde area by J. W. Shomaker, La Ventana Mesaverde field by J. W. Shomaker, Tierra Amarilla Mesaverde field by E. C. Beaumont, Monero Mesaverde field by J. W. Shomaker, Pagosa Springs Cretaceous area by J. W. Shomaker, Durango Fruitland area by R. C. Lease, Red Mesa Fruitland area by W. R. Speer, Fruitland field by E. C. Beaumont, Navajo Fruitland field by J. W. Shomaker, Bisti Fruitland area by J. W. Shomaker, Star Lake Fruitland area by J. W. Shomaker and R. C. Lease, Drilling and wash-ability testing by J. W. Shomaker and R. C. Lease, Economic factors in the utilization of San Juan Basin coal by W. R. Speer, and Sulfur in San Juan Basin coals by F. E. Kottlowski and E. C. Beaumont.
The report is a compendium of short, more or less self-contained papers dealing with the various coal fields and areas, and with other pertinent subjects. For the purposes of study, coal reserves were estimated in two broad categories-those consisting of beds three feet thick or thicker beneath 10150 ft of overburden, and those in beds five or more feet thick beneath 150250 ft of overburden. Data were gathered from all available sources and include: published geologic work, original geologic observation, private consultants' reports, logs of test holes drilled by holders of leases and exploration permits, logs of holes drilled by the New Mexico Bureau of Mines and Mineral Resources, reserve calculations furnished by operators, and information from oil and gas tests. The best use was made of whatever data could be found for a particular area; therefore reserve estimates range in reliability from proven tonnages to speculation based on geologic inferences. An effort was made to give an evaluation of the reliability of each estimate. Coal quality was determined from published and unpublished analyses by the U.S. Bureau of Mines, analyses furnished by operators, and U.S. Bureau of Mines analyses of samples collected during the study.
The San Juan Basin is a major physiographic subdivision of the Colorado Plateau in northwestern New Mexico and southwestern Colorado. The basin is about 200 mi long (north to south) and 130 mi wide, and includes about 26,000 mi2. The strippable coal areas lie along the basin's margins-mainly the western and southern-in roughly concentric belts of outcrop of coal-bearing strata of generally Cretaceous age, with rolling, sparsely grassed plains interrupted by low cuestas and mesas, and broad sandy washes. Coal is found in three major zones of the Cretaceous sequence. In ascending order, they are: the Dakota Sandstone, the Mesaverde Group, and the Fruitland Formation; the three are separated by barren strata of greatly varying thickness.
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