150 



o 

 o 



</5 



z 

 < 



100 



50 



MINE STUDY AREA 



HUNTING DISTRICT 650 



1976 



1977 



1978 



1979 



Figure 11. Year-to-year changes in pronghorn production ratios. Circle west study 

 areas (based on July-October ground and aerial survey data). 



100 n 



WINTER SUMMER-FALL 



•- • MINE STUDY AREA 



(INCL. PERMIT AREA) 



■ ■ PERMIT AREA 



1976 



1977 



1978 



1979 



Figure 12. Year-to-year changes in pronghorn summer and winter density indices 



for the Circle West study areas (based on the largest aerial 



censuses obtained for the mine study area'^"'"'"ig July-October and 

 December-February , respecti vely) . 



40 



