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<br />Pronghom populations are reduced over much of their range that includes grass and sagebrush <br />habitats of the western United States. On the proposed site of the coal mine and its associated <br />facilities, pronghorns are located only on the northern and eastern boundaries of the coal mine, the <br />waste disposal site. They occupy the grass habitat in greater numbers (0.1-0.5 per hectare). <br />Although there is little of their habitat that will be seriously impacted and there is sufficient for the <br />population levels, concern must be given to the disposal area and the coal conveyor to guarantee <br />they do not interrupt habitat utilization. The coal conveyor was constructed to allow adequate <br />passage of pronghorn to facilitate near normal habitat utilization. The disposal site was originally <br />thought to potentially obstruct a natural antelope passage from range to the north of the site to a <br />permanent water source at Cactus Reservoir. Pronghorn frequent the active portions of the <br />disposal area using the wide-open black surface for a bedding area. The sediment ponds are also <br />heavily used as a water source by pronghorn and other wildlife species. <br />LITERATURE CITED <br />Braun, C.E., T. Britt, and R.O. Wallstad. 1977. Guidelines for maintenance of sage grouse <br />habitats. Wildl. Soc. Bull. 5:99-106. <br />Dalke, P.D., D.B. Pyrah, D.C. Stanton, J.E. Crawford, E.F. Schlatter, 1963. Ecology, productivity, <br />• and management of sage grouse in Idaho. J. Wildl. Manage. 27:811-841. <br />Johnsgard, P.A. 1973. Grouse and quails of North America. University of Nebraska Press, Lincoln. <br />553 pp. <br />Patterson, R.L. 1952. The sage grouse in Wyoming. Sage Books, Inc. Denver. 341 pp. <br />Personal Communication. Clyde L. Pritchett and Clive D. Jorgensen. Dept. of Zoology Brigham <br />Young University, Provo, Utah. 25 Sept. 1980. <br />Scott, J.W. 1942. Mating behavior of the sage grouse. Auk. 59:477-498. <br />IV.M.4 Perturbation Values for Prime Species The perturbation values listed (Table II.H-43, <br />II.H-44) for the self-identified prime species are a composite of the potential impacts that might be <br />imposed upon the species by the proposed actions. The plan to minimize the effects is herein <br />presented by species. <br />Waterfowl -Waterfowl are prime species due to their value as game. Many species are summer <br />breeding residents but the potential for summer breeding is great. They are ubiquitous but restricted <br />to waterways or impoundments. <br />PermitRev.4f11/2002) IV-48 <br />