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SENT BY~Administration Office ~ 5-23-94 ~11~43AM CYPRUS YAMPA VALLEY <br />United States Department of the Interior <br />BURF~U OF LWD Mr4\,1GE.~fENI' <br />littk Snaky Reaoutre Area <br />1480 7ndurrrial <br />Craig. Colorado 81473 <br />Nay 17, 1994 <br />Aiehard Mill^ <br />Manager, 8urtace/Environment <br />Trenty Mile Coal Company <br />29415 Aoute County Aoad I77 <br />Oak Creak, DD 80467 <br />Desr )tr. Millet <br />303 632 6106 # 3 <br />in Aeply AeteY Tot <br />3450 (170) <br />COCS35a0 <br />Ne haw compleeed our reviar of SVentymile Coal Company•e (TCC) Technical <br />Revision 94-17 (aouthrest~District laMl Eatteneioe and ventilation borehole) <br />and have recammanded approval of the revision. Tha data submittal indicates <br />there will bs no eurfaee impacts within she boundaries of the fish Croak <br />alluvial valley floor or flood plain in 8sotion 36, T.SM., R.e7r., MWk11N~ttilf4 <br />as reQuiral by the lases stipulations. Tha subsidenoe awnieorlnq proposal ae <br />outlined on pagan 9.05-3(b) and 1.05-129(D) o! TA 94-17 is deemed adequate. <br />In your latter o! April 95, 1994, you pprovidal al estimate of 994,ti94 <br />additional tons to Da mined in the revision area. ~ As discussed on the phone,. <br />w !eel that the BI.M estimate i^ a more aaeurate reflection of attual <br />raeovezable coal far this ravteion: Our estimate o! the additional <br />reeovsrable raaerves era as Poliovar <br />1. 200 ft, x },9a0 !t ~ 39],000 fhYz <br />9. 39,000 !t s acre / 43,560 !t ~ 9.0 acres <br />3. Mining height ~ 9 !t <br />4. Coal density ~ 1,760 tons/aura-feat <br />S. Aeeovory factor ~ 90~ (moat of the additional tomags la longwall <br />produotion) <br />9.0 acres x ! !t x 1,760 tone/sera-!t x 901 ~ 178,290.91 tons ~ 126,000 coca <br />She original lease zeeowrabla ,accrue eatimata ran 3,Sa4,000 tone. Tor <br />federal coal Lsasinq Aawedmsnt^ Aot (!Call) purposes, the rseowrable rsserw <br />figure for !sass Coc53560 la ad~uetal to ],71],000 tens affsetive January 1, <br />1994, the issue date o! the lanes. <br />i! you haw any queetione eonesrninq chic matter, please contact Jezry etrahaa <br />at (703) 891-4441. <br />eineersly, <br />Jobn x. Husband <br />,a~ASea !tanager <br />