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2.05 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES - <br />MINZMUM REQUIREMENTS FOR OPERATION AND RECLAMATION PLANS. <br />• Ventilation <br />The mine is currently sealed and the ventilation shafts and fans are <br />removed and backfilled. When operational, the mine used an exhausting <br />ventilation system. Mining was performed in small districts which <br />were sealed after extraction in order to maximize ventilation <br />efficiency. ventilation is closely monitored by mine officials and <br />inspection agencies and conforms to mine specific approved ventilation <br />plans. Because Bowie No. 1 is now closed and sealed, it no longer has <br />an approved ventilation plan. <br />Roof Control <br />At the Bowie No. 1 Mine, the "D" Seam is overlain with mudstone as the <br />immediate roof. The mudstone is unacceptable as the immediate roof. <br />It is thinly laminated clay and silt which is commonly rooted and <br />vertically fractured by the dense cleat system and slickensides. When <br />used as immediate roof, this material spalls out in large chunks <br />before roof bolts can be installed. Once exposed to air, the mudstone <br />deteriorates as air and water in the mine atmosphere cause it to <br />separate and fall. The poor roof conditions created by this mudstone <br />roof is made worse by the presence of meandering sand channels found <br />throughout the mine roof. <br />Historically, acceptable roof conditions are established when three <br />feet of top coal is left in place as a beam to support the mudstone <br />immediate roof. Eight foot long roof bolts are used to support the <br />roof, along with timbers, ground cribs and other roof support devices <br />as needed. <br />Production Rate <br />Mining ceased at the Bowie No. 1 Mine on December 9, 1997. There are <br />no plans to reinitiate coal production at the Bowie No. 1 Mine. <br />Historically, the mine produced coal at a rate of between 0.5 and 1.5 <br />million tons per year. This run-of-mine production was transferred to <br />a crushing and screening plant via a downhill conveyor system with a <br />2,000 ton surge capacity. large rock, metal and other extraneous <br />materials were removed before the product was screened to minus 2 <br />inches. The prepared product was then trucked to the Bowie No. 1 Unit <br />Train Loadout, located near the Union Pacific Railroad just south of <br />Highway 133 and just east of Paonia. <br />Major Equipment ' <br />The mine is closed and all machinery removed. Historically, the mine <br />used ripper style continuous miners for coal extraction. <br />The cavity made by the extraction o£ coal was then supported by <br />drilling holes in the mine roof with roof bolting machines and then <br />inserting fully resin grouted headed rebar into the mine roof. Bolts <br />were typically eight feet in length and were generally used in <br />conjunction with roof mats. The roof mats controlled spalling roof <br />and provided additional bearing to the roof. <br />• <br />Throughout the life of the mine, several methods of haulage from the <br />continuous miner to the mine conveyor belt system were used. The <br />predominant method was by diesel powered coal haulers called <br />"Teletrams". These large diesel haulers accepted coal £rom the <br />continuous miner and then transported the coal up to 1500 feet to the <br />mine conveyor system where it was discharged frcm the bed of the <br />Permit Renewal - 3 - 01/03 <br />RN-o 4 (4~9~oy~ <br />/~l2-~ a6 <br />