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Fall and spring migration of mule deer, antelope, and elk occur at the mine site. Elk (Cervus elaphus) numbers have increased sinced the record snow fall of 1985, when large numbers of elk migrated into this section of Rio Blanco County. Preliminary environmental impact data for this mine did not consider this to be critical elk winter range. The conveyor arrangement at the mine directly bisects the natural drainages and migration corridors for biq game. All big game therefore, must cross over or under the beltline within this area, and hence the placement of passage structures. The conveyor structure at the Deserado Mine is 1.7 meters wide, with a corrugated metal cover placed over the top and has vertical support legs supports placed 6.1 meters apart. The conveyor emits a constant noise reading of 64 decibels at 1 meter, 59 decibels at 6 meters, and 55 decibels at 12 meters. Conveyor noise levels were 13 decibels lower at this mine compared to Plateau Mining Company's Star Point mine in Wattis Canyon, Utah ( Dalton 1984). Transect stations with topographic features can be found in Table 6. Also listed is the distance between each over and underpass structure. Dominant native plant communities include such species as big sagebrush (Artemisia tridentata), western wheatgrass (Agropyron smithii), and juniper (Juniperus scopulorum). METHODS A total of 20 transects were run during the fall and spring of 1988 through 1991. Snow accumulations over the past three years have been below normal and comparatively dry. All crossings were monitored whether they were greater than 3 meters in height or not, in order to determine any areas of avoidance. Track counts were identified as to species and direction of travel and total numbers were tallied using 2 - U.S. Government Type Tally Meters. Field tracks were identified using Peterson Field Guide to Animal Tracks (Murie, 1954). Track count surveys followed guidelines in the Wyoming Game and Fish Department, Handbook of Biological Techniques (1982). Conveyor noise levels were measured with a Gen Rad Inc., Permissible Sound Level Meter, Type 1565-b. Line transects were run along a South to North route that followed the beltline orientation. A conveyor access road was used which is located on the east side of the structure and follows the beltline along the majority of its length.