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J <br />iii iiiiiiiiiiii-iii <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcpanmunl ul Natural ReSOUr~ee <br />I {I I Sherman SL, Roum ?15 <br />D~•nvrr. Colorado HO'_03 <br />Phnnu: UI) it :Ihfi~35fii <br />FA%:IlUh H7'-H106 <br />November 17. 1998 <br />Mr. William .4. Bear Jr. <br />Bowie Resources Limited <br />Bowie No. 2 Mine <br />P.O. Bor 433 <br />Paonia, Colorado 81423 <br />RE: Inspection Follow up, Gob Pile, Bowie No. 2 Nline, Permit No. C-96-033, Bowie <br />Resources Limited. <br />Deaz Mr. Beaz: <br />~~Ib~ <br />DEPART~b1E~+T OF <br />NATURAL <br />RESOURCES <br />Rov Romer <br />Governor <br />tames S. LochheaA <br />E~ecmrve Director <br />.~1~chael B. Long <br />Division Director <br />In a letter dated Mazch 4, 1993, the Division asked several questions to Bowie Resources <br />Limited (BRL) concerning the gob pile at the Bowie No. 2 Mine. Since then, BRL has replied to <br />these concems with several submittals, the most recent beint? a letter dated September 28, 1998. <br />This letter is to summarize the progress in resolving the Division's concems. The italicized <br />comments aze the Division's original cotments from the Mazch 4, 1998 letter. <br />The Division would like to know the source of the moisture in the coal waste. Is it from <br />mine water seepage within the mine or is it from exposure to melting snowfall or rain dote <br />to the storage of the coal waste on the portal bench? <br />In the letter dated September 28, 1998, BRL confirmed that the source of the moisture in <br />the gob material came primarily from precipitation falling on the pile as it was being <br />stored temporarily on the portal bench. The Division encourages BRL to be awaze of the <br />potential for saturation of the gob material, whether in temporary storage or when placed <br />in the gob pile, the latter partially being a function of proper surface drainage of the gob <br />pile. <br />2. The Division believes that the higher than anticipnted moisnlre content in the coal mine <br />waste and the addition of srtbsoi! material to the con! mine tivaste may have compromised <br />the slope stability analysis that had been performed for the gob pile. The slope stability <br />analysis of the gob pile was based on the material properties and a Standard Proctor <br />compaction rest of coal waste only. This is stated on pages 30 and 21 of Y'oltlme /V of the <br />permit application. The Division believes that an ndditiona! material properties rest, or <br />tests, inc/rtding a sieve analysis, and another Standard Proctor test, or tests, should be <br />