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,, III IIIIIIIIIIIIIIII .~~. ~~. Tom- ; 999 - • United States Department of the Interior a~ ~(.° 6UREAL OF LAND \tAVAGE\IE~T ~~ `-~-~ ~ COLORADO STATE OFFICE ~ ~ '•~ ~ ^ +~,,,,w° ?850 SOCVGFIELD STREET LA6EN'OOD. COLORADO HO?15-;07K CO-921B(ALV~ 3460 C-37210 Coal AUG 7 1992 DECISION ~- Cyprus Orchard Valley Coal Corperticn .~~~4; ~ ~;'.t.:, -~ P.O. Box 3299 `'- Englewood, Colorado 80155 ~U~'`~ 7 1990 DII~~cIUiu ~~, Lease Stipulaion Revised .b11NEp,y~y x ~Ev Federal coal lease C-37210 was issued effective Iv[ay 1, 1984. As mine developmen[ progressed, Bureau of Land Management District personnel determined 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 [he 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-sou[h direction rather than east-west as now s[ipula[ed. It also will allow the Colorado Mined Land Reclamation Division (under audtority of the Surface Mining Control and Reclamation Act of 1977, as amended) to review proposed chances in the existing mine plan to determine whether limited exraction 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 limi[ed in buffer zones es[ablished along Eas[ Roa[cap Creek and Stevens Gulch where the overburden is 600 fee[ [hick 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 [hese water courses will be permi[[ed 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 forma ion is 15 to 20 de,ees). The revised stipulation is effective Augus[ 1, 1992.