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STATE, OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 275 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />March 21, 2002 <br />Mike Kolin <br />Greystone Development Consultants, Inc. <br />5231 South Quebec Street <br />Englewood, CO 80111 <br />RE: Technical Revision No. 8 (TR-08) <br />Lorencito Canyon Mine, #C-96-084 <br />Initial Adequacy Review, Fill 5 and 8 Enlargement <br />Dear Mr. Kolin: <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINiNG•SA FE7Y <br />Bill Owens <br />Governor <br />Greg E. Watcher <br />Executive Director <br />Michael B. Lang <br />Division Director <br />The Division of Minerals and Geology has completed an initial review of the materials received <br />March 19, 2002 for Technical Revision #8 (TR-08), Fill 5 and 8 Enlagement for the Lorencito <br />Canyon Mine. Due to the signifcant changes to the cost estimate, the Division will need <br />additional time to review that portion of the submittal. For any necessary revised information <br />submitted as a result of this review, please submit two copies of all revised materials. <br />1. Revised SEDCAD+ for pond 006a and Figure EX 15-9a is adequate. However, the <br />Division did not receive a current SEDCAD+ design run for the 25-year storm event for <br />pond 006a. Please submit this information consistent with Figure EX 15-9a. <br />2. Ditch D96, D97, D98, and D99 aze not included on the Jeff Canyon Surface Mine -Fill <br />Areas -Ditch Summazy. Please correct as necessary. <br />3. Ditch D76 should extend entirely around the "Mined ridge" on Figure EX 15-15. Please <br />correct as necessary. <br />4. Fill 8 is classified as a valley fill by definition and in Exhibit 13 of the permit. Drainage <br />from above the fill and from the fill must by directed to diversion ditches that can safely <br />pass the 100-yeaz storm event (Rule 4.09.2(7)). Ditches D81 and D82 are not located <br />above the fiIl but are in fact on the fill itself. Drainage from the area above the annotated <br />plan view contour of the N seam outcrop must be diverted azound the fill to sediment <br />pond 8. Ditches D81 and D82 will still likely be required to prevent flow over the face of <br />the fill (Rule 4.09.2(5)). Please correct as necessary. <br />