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_=~~„~ However, in sortte Lnshanres where suitable quality coal 1s 4ear- the surface, the <br />ov@rburdan may be removed with a com6ihation of dozers ~tnd scrapecs_ The over- <br />buCd40. W4uLd ct~ya be hauled to, a stc~ck4ile. oc pla<-ed qn mined-ouc argas £or evon- <br />tual regrading and rstopsoiligg. <br />Thw prin::iple mining method used at TiapPer is dip-1i_ne mining, ti .e„ raining in <br />ships pgral_lel tq ttre gown hill dip of the Coal seams, Each pit is adjacent and <br />pat all,el to thb previ,pug oqe. Pi,t tridChs vaRy accocding t0 the speci,ELc site. <br />Typically, roach cuc is initiated near the caal outcrop hnd workeq down the hill <br />until th@ dipping coal becomes Coo deep to remover ecohomicallY. On occasion, <br />the Crrt may be worked yip t;he hill. When more tb~n one Bean i5 recovered, rbe <br />patting is temw ed irr orye o£ several methods, Thin partings up to te,n feet th1ck <br />ar0 rumobed with a 9ozer, barkhne or simtilAr equipmpn[. Thicker partings are <br />removed wittn a dtUgline, 1'art;ing m~ty be stri,ppzd up-dip or down-di0 depending on <br />thu pArCicular situation. Strike-link mining may ba perfvrmed in:,tead bE the <br />prpsegt dip--line mining method ik gholagic cwndtions allow. <br />The tbp of the uncovered cogl is cleaned with equipment such as a front-end <br />loader, motor graders of rgbber tired dozer. The Goal is then either ripped with <br />a dozer 4r drilled with a Cwiq-m~stc>d coal drill add khen blasted. Hole spacings <br />vary depending on cnml thickness, <br />Thy hi~lee are lnacied with AN-FO or other blasting agentG aqd stehimed With dri1L <br />cuttings, 'The blast circuit Ys then completed and the blast is initiated {refer <br />to Section 3.4). <br />Large baCkhves vi frvnt end loaders are used to load the c4 al into haul trucks. <br />The coal haulers CrahspOrC the coal frcxn the pit; tv the power plant's grizzly or <br />a coal. stockpile. The coal haulers exit the pit via an inClihed ramp and enter <br />onto the haul road system ChaC cpnn@cts each pit Co [he power plant's g[izzl,y and <br />the cAal stgckpiles. AL a lacer date, a conveyor system may replace part of this <br />truck haul. <br />~' 3-14 <br />1 <br />R~.VISED FEB 1 ~ `gl ~, <br />