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., ' <br />XBOW ~ <br />Sanborn Creek Mine <br /> <br />THIRD QUARTER 1997 <br />K3INEERING INSPECTION <br />EAST YARD GOB DISPOSAL PILE <br />The Sanbom Creek Mine approved permit document includes the requirement to inspect the cos! <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 wnstmction of earth and rockfill <br />embanlrnrerrts. Both Bear Coal Comparry and the Sanbom Creek Mine have approval to dispose of <br />coal mine waste in the gob pile. <br />On September 22, 1997, I performed a visual inspection of the east yard gob disposal area at the <br />Sanbom Creek Mine. The gob disposal area was wet from recent rains. Nothing was observed <br />during the inspection that would indicate the pile has a potential for failure. <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 results for the <br />inspection performed during July are attached. <br />A medium amourt of material was placed on the pile during the quarter, resulting from roof falls in <br />the mine. Safety beans have been constructed on the downhill edge of the pile as a requirement by <br />the Mine Safety and Health Administration Clean cover material obtained horn the annual ditch <br />cleaning this spring was phrced on top of the pile on the east end, in anticipation of reclamation of <br />the pile as part of constnuction of the new West Valley Fill. Plans are to survey the pile on at least an <br />annual basis for accurate volume reports. The pile was surveyed at the end of the fourth quarter of <br />1996. Surveyor John Menke reports calculation of the volume for 1996 as 1,041 cubic yards. Bear <br />Coal Comparry did not haul any material to the gob pile during the last three years. The Bear Mine <br />was closed during December of 1996. Bear Coal Company may haul material to the gob pile as part <br />of the reclamation of the Bear Mine. <br />An application for a Technical Revision was submitted to the Division for a new coal refuse and <br />mine development waste area The new area will be located to the west of the facilities area, and <br />will be known as the West Valley Fill. Technical Revision Number 29 was approved, but due to the <br />timing of the approval, and the necessary requirements to put a contract in place for the work, <br />construction of the West Valley Fill will not begin until 1998. <br />c.;. <br />~a• <br />C. A.ndetsbn ;:' Date <br />~~~::-`' <br />~~~eet,l3o; 14726 <br />7 <br />P O Box 5 3 5 Somerset 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 />