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<br />VED <br />SEP 171999 <br />THIRD QUARTER 1999 <br />ENGINEERING INSPECTION DNision of Minerals 8 Geology <br />EAST YARD AND WEST VALLEY FILL <br />GOB DISPOSAL PII.ES <br />The Sanborn Creek Mine approved pemvt document includes the requirement to inspect the coal <br />mine waste pile for stability quarterly. The inspection is to be performed by a registered engineer or <br />other qualified professional specialist experienced in construction of earth and rockfill <br />embanlanents. Both Bear Coal Company and the Sanborn Creek Mine have approval to dispose of <br />coal mine waste in the gob pile. <br />On September 14, 1999, I performed a visual inspection of the East Yard and West Valley Fill gob <br />disposal areas at the Sanborn Creek Mine. The East Yard gob disposal area was dry. Nothing was <br />observed during the inspection that would indicate the pile has a potential for failure. Safety berms <br />are required on the downhill edge of the pile by the Mine Safety and Health Administration. <br />Compaction tests were performed for fourth quarter 1993, second quarter 1994, fourth quarter 1994, <br />second quarter 1995, fourth quarter 1995, second quarter 1996, fourth quarter 1996, and third quarter <br />1997. Gob material has consistently passed compaction tests. Compaction tests aze required, as <br />necessary, based on the amount of material added to the waste azea. Compaction tests aze planned as <br />material is added to the waste area. <br />A considerable quantity of material has been removed from the East Yazd azea for use as base <br />material for the new coal stockpile. Plans are to survey the pile on at least an annual basis for <br />accurate volume reports. Surveyor John Menke reported the volume of material removed during <br />1998 as 26,617 cubic yazds. A considerable quantity of material has been added to the East Yazd <br />azea as part of the clean-up after the mine fire. Bear Coal Company did not haul any material to the <br />gob pile during the last five years. The Bear Mine was closed during December of 1996. Bear Coal <br />Company may haul material to the gob pile as part of the reclamation of the Bear Mine. <br />3 7 3 7 Hwy 1 3 3 P O Box 5 3 5 Somerset C o l o r a d o 8 7 4 3 4 U S A <br />TEL (9 7 0) 9 2 9- 5 1 2 2 FAX (9 7 0 ) 9 2 9- 5 7 7 7 <br />~ ~ <br />