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--~_„~ However, in some Lnshanres whyre suitable quality coal Ls 4ear the surface, the <br />overburden may be removed with a combination of dozers rind scrapers. "1'he over- <br />burdFn wquld ct~en be harp ed to a stockpile. oc placed qn mined-ouc areas far even- <br />tu91 regrading and rstopsoiliclg. <br />Thw principle mining method used at Trapper is dip-li_ne mirtin@, tii._e„ raining in <br />ships parallel tq the Qorm hill dip of the coal yens, Bach pie is adjacent and <br />pat all,el Co thb previ,aug oqe. Pi,t tridChs vary accocding to the specific site. <br />Typically, roach cuc is initiated near the coal outcrop and workeq down the hill <br />until th@ dipping coal becomes Coo deep to recover ecogomicall_y. On occasion, <br />the arrt may be worked rip t;he hill. when more thz~n one seam is recovered, the <br />patting is removed irr ore a£ several methods, Thin partings up to te,n feet thick <br />ar0 rumobed with a 9ozer, backhoe or similar equlpmanC, Thicker partings are <br />removed wittn a dtagline, Part;in~ may be stripped up-dip or down-dip depending on <br />the pArticular situation. SCrike-link mining may ba perfvrmed in:,tead bf the <br />prpsegt dip--line mining method ik gholagic conditions allow. <br />The tbp of the uncovered coal is cleaned with zquipment such as a front-end <br />loader, motor graderr of rubber tired dozer. The coal i» then either ripped with <br />a dozdr Or dri.Lled with a t;wiq-masts>d coal drill and Cheri blasted. I{ole spacings <br />vary depandjng on cool thickness, <br />Thb hales are loaded with AN-FO or other blasting agentfi aqd stemmed with drill <br />cuttings, 'phe bias[ circuit 1s then completed and the blast is initiated (refer <br />to Section 3.4), <br />Large backhves or front enfl loaders are used to load the coal into haul trucks. <br />The coal haulers CrahspOrt the coal from the pit tv the power plant's grizzly or <br />a coal. stockpile. The coal haulers exit the pit via an in~lihed ramp and enter <br />onto Che haul road sysCem ChaC connects each pit Co [he power plant's grizzly and <br />the coal stockpiles. AL a lacer date, a conveyor sysCem may replace part of this <br />truck ha 41. <br />41 <br />3-14 ~ <br />R~.V15ED FEB 13 `81 ~, <br />i <br />