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;,er-cu-an nun :j~de <br />JOHN F. ABEL, JR. <br />MINING ENGINELII <br />John ' Rb~l Jr <br />FAX N0. 3032188183 <br />P, O 1 <br />a,o ~ooKOUr wew eowrr <br />OOIDLN, 00 p101 <br />~A%I7Mlp <br />/MRe~IrFw.wn <br />September 19, 1998 <br />Mr, Tom Anderson <br />Oxbow Carbon and <br />P.O. Box 535 <br />Minerals, Inc. <br />Soserset, CO 81434 <br />REFERENCE: Predicted "D" Seam longwall impact on Boar Crsek <br />Daaz Tom: <br /> <br />This letter report was prepared as you requested during our <br />September 16th discuaaion with Desty D. Dyer of the U.S. Bureau of <br />Land Mnnegeraent concerning the potentisi impact o! "D' Seam <br />longwall mining on water carried intermittently in Bear Creek. star <br />Creek overlies parts o! planned Paneis 7 - 12, sa altuwn on Plal.a it <br />of the report "Predicted "D" Seam longwall subsidence" dated August <br />17, 1998. Specifically the question ia, "MhaC is the possibility <br />that water flowing intermittently in the Bear Creak drainage will <br />ever be captured by longwall subeidence't^ The possibility le <br />extremely remote as will be shown. <br />Subsidence accompanying planned Panel 7 longwall mining will <br />result in maximum subsidence and strain o! the Bear Creak drainage <br />because the overburden thickness separating the "D" Seam from the <br />stream course is the minimum, approximately 400 feet. The minimum <br />separation ie present at the southern and of the panel, the final <br />barrier pillar. The height of the Caved rock rubble above the <br />longwall mined area ie critics! to the Dotential for total and <br />immediate diversion of Bear Creak into the "D" Seam workings <br />because of the high parmeabllity of rubble. Tha naxSmum height oP <br />the saved rock rubble is pri:aarily a !unction of the mining height. <br />Tha maximum mining height n! Oxlx~w~s longwall eriuipmsnt is 12 foot. <br />~LLAPS~,~K ZONE FIEIGH'P ABOVC PANEL, ROOF <br />H. F. Schulte reported at the 1957 Leeds Conference on a winze <br />sunk into a caved area attar longwall mining and subaidenca had <br />elfectively ceased to influence that particular part o! a caved <br />longwall. Schulte reported that tho first ihroo scam thicknooaao <br />• <br />