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proposed actions will not alter nor create problems with their habitat but will create problems for the <br />bobcat. The perturbation value of 5 is based on increased accessibility, more people in the area <br />and hunting pressure associated with such. <br />Pronghorn 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. 59:477498. <br />W.M.4 Perturbation Values for Prime Species The perturbation values listed (Table II.1-1-43, <br />II.H44) 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 />Minor Revision #147 (05/2011) IV -4 9 <br />