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-'J ~~~ REC~,~~. pu~~1'~ r ~~v t5\ &~ GE~~I)~ ~ M~N~~P`S DECISION III IIIIIIIII IIII III Cyprus Orchard Valley Coal Corporation P.O. Box 3299 Englewood, Colorado SO155 CO-921B(ALW) 3460 C-37210 Coal A U G 7 1992 Lease Stipslation Revised Federal coal lease C-37210 was issued effective May 1, 1984. As mine'development progressed, Bureau of Land Management District personnel detemuned that federal coal would be bypassed within and north of the Stevens Gulch buffer zone unless Sec. 31(g) of the lease was revised. Approximately one-third of the estimated 375,000 tons of recoverable coal lies within a "limited mining" area. Montrose District staff evaluated the impacts of changing the stipulation in Environmental Analysis U-92-19, dated June 19, 1992. Revision of the stipulation would allow entryways to be driven in a north-south direction rather than east-west as now stipulated. It also will allow the Colorado Mined Land Reclamation Division (under authority of the Surface Mining Control and Reclamation Act of 1977, as amended) to review proposed changes in the existing mine plan to determine whether limited extraction could occur without causing subsidence that would impact water resources in the area. Therefore, in the interest of conservation of the coal resource, the second sentence of Sec. 31(g) of coal lease C-37210 is revised by replacing the words "west side" with "west and north sides." Sec. 31(g) now reads: Coal extraction will be limited in buffer zones established along East Roa[cap Creek and Stevens Gulch where the overburden is 600 feet thick or less in order to prevent all surface and subjacent disturbance of the overburden. If necessary, access entryways needed to extract the coal on the west and north sides of these water courses will be permitted through the buffer zones. The buffer zones will include the above mentioned bank-full stream channels and the alluvial/colluvial fill associated with them. The angle of draw used to protect these areas from subsidence will be dictated by site-specific geologic and mining conditions (the estimated angle of draw for the Mesa Verde formation is 15 to 20 degrees). The revised stipulation is effective August 1, 1992. Code Surnamr Date Cude tiurnemr D r Cndr >urnamr Date 2 9~ a'ash,n on F'ro ram Of(.