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<br />' oes6e TSR-7 <br />' TECHNICAL REVIEW BTAGE (TB) <br />REBPONBE 80RNAT <br />Nine/subject: Grassy Gao Mine <br />Project Number: C ~- ~_ - - - 039 <br />WATB Work Request Number: TAD 01417 <br />Bhort Title: Evaluation of AOC Restore <br />A. Ra~iew Criteria: <br />Approximate original contour (AOC) and slope stability. <br />Regulations of the Colorado Mined Land Reclamation Board for <br />Coal Mining (RCMLR) rule 1 section 1.04 and rule 4.14.1(2)(a). <br />OSM Directive INE-26 and INE-26-1 and approved plan. <br />B. Nateriala Reviewed: <br />Field visit to the Grassy Gap Mine location, and specifically, <br />pits 5 and 6 for AOC compliance with approved plan. Check of <br />reclaimed slopes for stability. Review of ACZ Inc. engineering <br />report. <br />C. [R]z No Deficiencies. <br />[ ]3 Deficiency(s) Resolvable By a Permit Condition. <br />[ ] Deficiency{s) For Which a Determination of Regulatory <br />Compliance Cannot He Nade: <br />1a. Btatamsat of Deficiency: <br />None <br />1b. Discussion: <br />/~~~JSf <br />A field trip to the mine site was conducted Sept~~er <br />:. 27, 1991 by Thomas E. Ehmett, Deputy Director <br />Albuquerque Field Office (AFO), Robert Inman, Mining <br />Engineer, .Western Support Section (WSC) and Catherine <br />W. Begej,Reclamation Specialist, of Colorado Mined LAnd <br />Reclamation Division (MLRD). <br />It was determined the pits in question (Grassy Gap Pits <br />5 and 6) were mined during an interim mining permit and <br />were mined and reclaimed prior to 1985. <br />The reclamation of the premining area was not returned <br />to the exact same contours as those prior to mining, <br />however, the contours are similar. The backfilling <br />of the highwall of Pit 5 is approximately 3 to 1 <br />(steeper than the original contour) but is stable and <br />has been, to date, successfully revegetated. <br />