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__~--,~ However, in sotae %ns>:anres ctnyre suitable quality coal 1s near the surface, the <br />overburden shay ba removed Witlz a comhihation of dozers rind scraPE'.rs, "Lhe over- <br />burd4n w4u1d ct~eo be hayled to, a stockpile. or hlaCed 4n mined-out areas for evvn- <br />tu91 regrad%ng and rstopsoilic{g, <br />The Pr'in.:ipie mining methoq u3ed at TraPPer is diTa-1i.az miyin~, tii._e., fiin1nS in <br />ships P§ra3_lel tq tYie gown hi21 diU of the goal aeons, Each Pit is adjacent and <br />pakall,el to Chs previ,pu~ oqe. Pi,t 5ridths vary according to the spaci,Eic site. <br />Tybically~ roach (:ly[ is initiated near Che real outcropsnd woskeq down thg hill <br />unkii th@ dipping coal becUmes Coo deep to re~bver ecogomically• pn occasiQn~ <br />th6 cyt may be worked hp t;he hill, When mate th§n one semen is recov6red, the <br />pattigg 7s Yemyved ire o~~e q€ Sevsrai methods, 'thin perti,nys up to te,n feet thi_tk <br />are removed with a Hoz~r, backhoe or siniilyr e9ulpmgn[, '1'hicksr ~ar{in~s ire <br />removed Wittr a drggl~na, Rart:in~ myy be ktr!,pp~d up-dip or dawn°dip depending on <br />the p§rticular situation. St;rii~e-line: mining may be Perfbrmed in,tead bf the <br />present dip--line mining method ik g@olagic cc:~ndtiPns allow, <br />Th° tbP of the uncovered coal is cleaned with ~'qu~ipm6nt such as a fcont~end <br />loader, niot<~r graders of rybbsr I_irad dozer. The e-oat i~ then either ringed with <br />a doz~?c 4r <lri.lied w~.th a [,wig.-m§sted coal dni11 ar~d t.he~7 blasted. hole spacings <br />vaYy d.ependf.ng on coal thickn@ss, <br />Tfib h<~le~ are loathed with AN-F~ or other blasting agfinto artd stehvmed with drill <br />cuttings, 'The blast circuit is then cUnpjetgd end the blast is initiated {re{er <br />to Section 3.~). '~ <br />Large 6a~,khUes or fcvnt enfl loaders ace Vsed to load thN coal into haul trucks. <br />The cpal haulers transport the coal frym the pit to the power plant's grizzly nr <br />a coal. stockpile, The coal haulers exit [he pit via an inCliryed ramp and eater <br />onto the haul road system fihaC cOOnNCts edch pit to the power plant's grizzly and <br />the cUal stpckpi[@s. AL a lacer date, a Conoeyor system may repl2ce part of Chis <br />[ruck haul. <br /> <br />3-14 <br />R~.V15Ep FEB 1 ~ `81 <br />