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III 1111111111111111 <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St.. Room ? 15 <br />Dem-er, Colorado 80.03 DIVISION O F <br />Phone f303) 856-3567 MINERAL S <br />FAY: (30]1 832-8106 & <br />GEOLOGY <br />DATE: December 21 ~ 1999 ~--~\ M EN I N GMS ATFIE T Y <br />TO: Joe Dudash Bill Owens <br />-- Governor <br />FROM: Jim Pendleton ~ - Greg E. Walther <br />Execwive D~~caor <br />M¢hael B. Lang <br />RE: Bowie N : 1 Mine 98 ANNUAL SUBSIDENCE REPORT Division Director <br />ermit No: C-81-038) <br />Bowie Resources, Ltd. (BRL) submitted its combined 1998 Annual Hydrology, <br />Subsidence and Inflow Reports for the Bowie No. 1 Mine in June of 1999. You recently <br />forwarded the combined report to my attention and requested adequacy comments <br />addressing the subsidence report. I offer the following comments for your <br />consideration. <br />(1) The subsidence monitoring stations are located on map No. 2-5, "Permit Term <br />and Long Term Mine Planning". Unfortunately the monuments are indicated in <br />pale yellow, which renders them effectively indiscernible. BRL should select a <br />discernable color for the subsidence monuments and revise the map <br />accordingly. <br />(2) The subsidence monitoring results are tabulated within the report. The data <br />tables contain several obvious survey busts and/or calculation errors. <br />Specifically, the tables for Station 16, Station DH55, and Station DH66 appear to <br />contain errors. These busts are referenced within the report survey station <br />summary paragraphs for Stations DH55 and DH66. An equivalent reference <br />should be inserted into the Station 16 summary paragraph. In addition, the data <br />tables should be annotated as well in future reports. <br />(3) A reference is made to Map 2-5A, which is stated to delineate the locations of <br />the seven Pitkin Mesa Pipeline monitoring monuments. However, no copy of <br />Map 2-5A was included within the report you forwarded to my attention. <br />The text summary paragraphs describing the mining involvement related to each of the <br />wide-grid subsidence monuments was clear, thorough and informative. <br />cc: Larry Routten <br />dos: M:\COAL\JAP\61SU698.WPD <br />JP/jp <br />