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Detailed chemical analysis of 40 drill-core samples (reported on whole-coal and laboratory-ash basis) from the Wind River Basin r Wyoming, indicate that 29 of the coals are subbituminous A, B, and C in rank. Eleven samples are bituminous C in rank, probably the results of intense deformation in the northwestern corner of the basin and depth of burial in the central part of the basin. The quality of the Wind River Basin coal is similar to other sampled western subbituminous coals. Chemical elements which are of environmental concern are found in the Wind River Basin coal beds in approximately the same concentrations as they are found in other sampled western subbituminous coals.