Coal quality is an important factor in determining whether a not
a coal resource is actually economic. With all the environmental constraints
now in place, the sulfur content, and trace element content are important
factors to consider.
Hoffman, G.K., February 1991, Geology and quality of the Menefee Formation coals, Monero coal field, Rio Arriba County, New Mexico; New Mexico Geology, v. 13, no. 1, p.1-8, 21.
Hoffman, G.K., Beaumont, E.C., and Bellis, D., 1992, Environmental controls related to coal quality variations in the Fruitland Formation, San Juan Basin, New Mexico; in Controls on the distribution and quality of Cretaceous coals, P.J. McCabe, and J.T. Parrish, eds.: Geological Society of America, Special Publication 267, p. 37-55.
Hoffman, G.K., Campbell, F.W., and Beaumont, E.C., 1993, Quality assessment of strippable coals in northwestern New Mexico: Fruitland, Menefee, and Crevasse Canyon Formation coals in San Juan Basin, and Moreno Hill Formation coals in Salt Lake field: New Mexico Bureau of Geology and Mineral Resources Bulletin 141, 84 p. Abstract