Table \.— Comparisons of key parameters of 22 Western Coat Mines'— Continued 



WEST DECKER MINE 

 Decker, Big Horn Coun- 

 ty, southeastern 

 Montana 



USGS7// maps: 



Decker 

 lat 45°03'N.; 



long 106°5rW. 

 sees. 8,9,16,17, T.9 S., 



R.40E. 



1972 



636 acres 

 through 

 1978. 



216 acres through 

 1978. 



Premining: 

 WUdUfe and 

 livestock 

 range; some 

 wheat. 



Intended: No 

 change. 



Livestock and 

 hunting ex- 

 cluded dur- 

 ing reclama- 

 tion. 



Growing season 

 (avg frost-free days): 107 

 June to mid-September. 



Temperature (°F): 

 mean annual: 46 

 range: -43 to 108. 



Precipitation (inches): 

 mean annual: 14 

 range: No data; 

 50 percent from April 

 through June. 



Rolling hills with 2- to 

 10-percent slopes and 

 divides and broad 

 drainage bottoms. 

 Outcrops of red 

 clinker and shale. 

 Some minor rilling. 



3,500-3,600 



Rolling hills with 4- to 

 8-percent slopes; nar- 

 row valleys. Spoils 

 reshaped to neariy 

 original conriguration 

 with minor rilling of 

 mined surfaces; heavy 

 sheetwash during 

 seasonal storms. 



4,460-4.520 



Sec Olcaaon (19791 tor published reclamation data on specific i 



10 



