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III IIIIIIIIIIIII III <br />999 <br /> <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcparlmcnl ul Nal oral Kesnurt e~ <br />I { I }Sherman SL, Knom ! I S <br />Dcnvcr. Colorado HO!113 <br />Phnnn: I }Il t I Hbh-J Sh: <br />FAX. 1 i0}I H }! H I Oh <br />December 14, 1998 <br />Nir. Rick Mills <br />Twentymile Coal Company <br />295.15 Routt Counry Road No. 27 <br />Oak Creek, CO 80467 <br />Re: Foidel Creek Mine, C-82-056, 1997 Subsidence Reports <br />Dear Mr. Mills: <br />The Division has reviewed Twentymile Coal Company's 1997 Subsidence Reports. This <br />review covers both January through June Report and July through December Report. The <br />Division's comments regarding Twentymile Coal Company's subsidence reports follow: <br />1. No visual monitoring reports were submitted for the Union Pacific Rail Line or the <br />electrical power lines in the Second Half 1997 Subsidence Report. No visual reports for <br />the Second Half 1997 were submitted for Routt County road No. 33, however Routt <br />Counry road No. 33 was not undermined during the second half of 1997. <br />Please provide copies of these visual monitoring reports to complete the file. <br />}~ <br />~~~~ <br />DEPARTMENT OF <br />NATURAL. <br />RESOURCE: ' <br />Ruy Rome <br />Gwernnr <br />lames S. Lochhead <br />Eaecunve Director <br />Michael B Lonp <br />Divis~nn Duectnr <br />2. Figure No. 1 contained in the Second-Half report presents the map and profile of Foidel <br />Creek above Panel 8 Right. The profile section presents profile lines titled "Pre-mining <br />Profile", "9-11-96", and "11-97". In the vicinity of station 255+00 on Foidel Creek <br />subsidence apparently created an impoundment, labeled "Foidel Creek Pond, Nov. 14, <br />1996, azea = 34,214 sq. Ft " on the map. The enlarged profile suggests that the <br />impoundment existed when profiled in November of 1996, but not pre-mining nor post <br />subsidence in November of 1997. No discussion is provided regarding this surface <br />hydrology detail within the text of the subsidence report. This could be a significant topic <br />of interest. Is a discussion provided anywhere else, such as in the Annual Hydrology <br />Report? Was the pond formed solely by subsidence troughing? Was it subsequent <br />breached by natural phenomena or artiticially eliminated'? This topic should be <br />thoroughly described somewhere within the various monitoring reports provided by <br />Twenty Mile Coal Company. <br />STATE OF COLORADO <br />