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MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1313 Sherman SI., Room 215 <br />Denver. CO 60203 <br />303 6663567 <br />FAX 303 832-6106 <br />pF CO,o <br />~6~//`~~`~9 <br />N '. -.fT.i~IL~;~O <br />~a <br />.~~1:. . <br />/876 ~ <br />Roy homer. <br />Governor <br />Michael B. Long. <br />Drvis~on Director <br />June 5, 1992 <br />Mr. Jim Stover <br />Minrec, Inc. <br />2768 Compass Drive, Suite 101 <br />Grand Junction, CO 81506 <br />RE: Adequacy Review for Technical Revision 9; Red Canyon Mine; <br />File No. C-81-034 <br />Dear Mr. Stover; <br />The Division has reviewed, for adequacy, your technical revision to <br />suspend subsidence monitoring at the Red Canyon Mine. The Division <br />has the following comments. <br />The last subsidence monitoring was completed in May of 1989, <br />following the permit renewal. Prior to this, the company performed <br />their last monitoring in 1986, following active mining. The May, <br />1989 monitoring detected a maximum of 0.3 feet of residual vertical <br />subsidence had occurred during the three year lapse. None of the <br />protected and monitored structures has ever evidenced any <br />subsidence. <br />The Division concurs with your request to permanently cease <br />subsidence monitoring at the Red Canyon Mine, with the provision <br />that monitoring will be reinitiated if any evidence of renewed <br />subsidence is discovered. Also, the Division requires that all <br />monuments remain in tact so that monitoring could be reinitiated, <br />if necessary. <br />Minrec should submit a revised page (to the original submittal), <br />which discusses the above requirements, to be inserted into the <br />permit document. Upon receipt of an appropriate revised page, the <br />Division will issue a proposed approval of your technical revision. <br />If you have any questions, please do not hesitate to call. <br />Sincerely,,- - <br />i~. ~% <br />°" <br />Christine Johnstlon <br />Reclamation Specialist <br />III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />