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<br />XBOW ~r~Fn/ED <br />Sanborn Creek Mine In AI O C ~pp7 <br />y.a ~ u~ <br />FOURTH QUARTER 1996 <br />ENGINEERING INSPECTION <br />EAST YARD GOB DISPOSAL PILE <br />The Sanborn Creek Mine approved permit document includes the <br />requirement to inspect the coal mine waste pile for stability <br />quarterly. The inspection is to be performed by a registered <br />engineer or other qualified professional specialist experienced in <br />construction of earth and rockfill embankments. Both Bear Coal <br />Company and the Sanborn Creek Mine have approval to dispose of coal <br />mine waste in the gob pile. <br />On December 3, 1996, I performed a visual inspection of the east <br />yard gob disposal area at the Sanborn Creek Mine. The gob disposal <br />area was partially snow covered. Nothing was observed during the <br />inspection that would indicate the pile has a potential for <br />failure. <br />Compaction tests were performed for fourth quarter 1993, second <br />quarter 1994, fourth quarter 1994, second quarter 1995, fourth <br />quarter 1995, second quarter 1996, and fourth quarter 1996. Gob <br />material has consistently passed compaction tests. Results of the <br />fourth quarter 1996 tests are attached. <br />A significant amount of material was placed on the pile during the <br />quarter, resulting from roof falls in the mine. Plans are to <br />survey the pile on at least an annual basis for accurate volume <br />reports. The pile was last surveyed during the fourth quarter of <br />1995. A survey of the pile is planned for the fourth quarter of <br />1996. Bear Coal Company did not haul any material to the gob pile <br />during the last year. <br />i <br />A failure of the pile would probably not be a hazard to human life. <br />The pile is located above a large flat bench referred to as the <br />east yard. The bench is 80' to 100' wide directly below the pile. <br />If the coal mine waste pile failed, it would very likely be <br />contained in the east yard. The overland conveyor and conveyor <br />drive on the bench below the pile might be damaged by a failure of <br />the pile. <br />Thomas C. Anderson '~7Date <br />Colorado Registered <br />Professional Engineer No. 14726 <br />P O. B o x 5 3 5 S o m e r s e t, C o l o r a d o 8 1 4 3 4 U S A <br />TEL (970)929-5122 FAX (970)929-5177 <br />