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-=~~ HoWeVer, in some i_nstanres whgre suitable quality coal 1s near the surface, the <br />overFaurdan may be rerhovgd with a com6ihation of dozers ~tnd scrgpE~cs- '1•he over- <br />burd4n W4uLcC ct~en be hayled to, a stockpile. oc pla<-ed qn m.ine3-ouc areas £ar evon- <br />tu91 regrading and rstopsoiligg. <br />Thy' Pr'in::iP~e hrin~ng methoq u3ed at TiaPPer is diF,-1i_ne minim, tii.e., fiining in <br />ships pgral_lel t4 ttre gown hill diG of the 4oa1 semis, Each pit is adjacent and <br />patall,el to thb previ,pug oqe. Pi,t 5ridths vary accocding t0 the speci,fLc site. <br />Tybically~ Bach ccrc is iniFiated near the coal outcrop §nd wor~keq dvwn thg h111 <br />unkil thg dipping coal becomes Coo deap to re~bver @cagomically• pn occasion, <br />th6 cyt may ba worked hp the hill. When mare tb§n one ee~n is recovbred, the <br />pattigg is kembveQ iry ohe q£ aevsrai methods, Thin partings up rn te,n feet th~_ck <br />are r§mobed with a 90z~r, batkhoe or simtil§r ~quLpmenG, Thickfir partin~+s ire <br />rernov6d With a dt§gline, Rart;in~ m§y be ktri,ppzd up_dip or dawn-dip depending on <br />tha p§rCicular situation. Shrike-line: mining map be performed in§tead of the <br />prasegt dip--line mining method ip g@olagic cWndtions allow. <br />Tha top of the uncovered co§1 is cleanad with c'quipm§nt su<.h as a front-end <br />loader, motor graders of r4bbsr I_irbd dozar. The Goal is then either ripped with <br />a dozar 4r <iriaied with a t,wiq-m§sced coal drill add k:he0. blastCd. Kole spacings <br />vary dep@ndCng on cn§1 thickn@ss, <br />Thy hi~lee are loaded with AN-FO or other blasting agknt~ aqd stehimed With dri1L <br />cuttings, 'she blast circuit is then cbmpletgd end the blast is initiated {re{er <br />to Section 3.4). <br />Large ba~khVes of front entl loaders are used to load the coal into haul trucks. <br />The coal haulers CrapspUrC the coal frcxn the pit tv the power plant's grizzly or <br />a coal. stockpile. The coal haulers exit Che pit via an inclihed ramp and enter <br />onto Che haul road sysC@m ChaC cUnnNCts each pit Co [he power plant's grizzly and <br />the coal stpckpil@s. AL a lacer date, a eonoeyor system may replace part of Chis <br />truck haul. <br />~I <br />3-14 ~ <br />l <br />R~.V15EQ FEB 1 "~ `81 ~ <br />