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• Carol Russell -3- J.ruar:7 2G, 1982
<br />c~ariances result in adr.7itic.nal excess o.arhnrderi m.rteriol, this e:•~cess
<br />meterial must be properly disposed of ti:rcugi~ .,n apprcrec? u)~~n.
<br />Overburden - Elastino
<br />7tlthoug9 the apnlicar,t has previously received ap]:roval, unc?cr the interim
<br />permit program, fo.r a modified scale dir:tcnce equation, the apn.Iic,rtion
<br />corunits to conformance with the- standard equation, as container? in P.;;1e -;.09.4(10? (b) (i~ .
<br />The loading parameters ccntaired in Table 2.05-6, "Blasting Parameters -
<br />Cverburden", agree n•ith that equation and are, therefore, in compliance with
<br />the regulations. In addition, the schedule, publicatio:~,, warning ant report
<br />schemes ,resented iP. the a?,piicatien are also in comp.iiance caith the reyu-
<br />letions.
<br />Surface ^lini;~o IJear Jn~+ergrounc l9in:na
<br />Zfie applicant's proposed mining through abandoneri cr,dergro:rnd n'nrF:in.rs, in
<br />order to m_~zimize resocrce recoverq, as relatei on pa yes 2.05-~i c.nd 2.05-54,
<br />is in compliance eai. t.'a the performa,^ce ..;=an,9~u'ds a` Pule 4. 22.1.
<br />Auger 19i ni nq
<br />The annlicant proposes to cone+act auger mining :rcr; t!z_ h'qI->:;c21 :~f the conto:~r
<br />strip pits prior to backf.illing of the contouz' pit. Insufficient :Cni~ormation
<br />is presents-d on page 2.OL-3 and 2.06-4 co fir:d co~.aplia,~,ce >:ith Ec1e a.23.
<br />The applicant should amend file a,~piicatiun to de:nonstra*~ the ^ronosed plan
<br />t:•i11 net enr?a::yer the- ctabi_'ity of the high:;,:?' of the ,oir curing operations
<br />cr the stahilit_u of fire backf~lIed nit follo:air,c; ..ssatior,. Both n,: these
<br />concerns relate to t!:c strenyt_h of the acyerec? ..igh;:ail. ''~~iiure of the
<br />auyered coal seam ::ould aLen the hiyhr;all to subsi~'e, pcss:h_y imposing a
<br />latera_' Zcad upon the bacF:fi11 ar.d possin1u alleraind ir.`ilfra„ion cf moisture
<br />ir. the suhs_ded area. The technoloy of aurae- mining is, c^rri.ttec?l.y, Iimited
<br />and site-specific. The apeli.cant is referred to 2.5. -nzea,z of r.?i .ne's ooen
<br />File .Report 10fi-'u, prepared in octobe_, 19'5, for cu'da::ce ir. this regard.
<br />1 coat' is avsilabie for e::aminaticn in our offica. The appiica.-:t should amend
<br />the applicati.cr. to demonstrate that the prcposea auger *::i.aing plan sri11 not
<br />compromise r_ne s*_abilitu of the I;i~h::'all or the rcntour _r.i*_ baokfili.
<br />David Cz'aig's :remo to i:ou, dated January 22, 192, references a second concern
<br />in re yard to auger mining. Da~•e observers that the ground avatar table nay,
<br />:;ith time, "erE:^tually rise to the elevation, of tee current m[ninq sctiv.ities."
<br />If this :acre to occur-, the eager holes .ray present ~. cor,du.it to s~rturate th_~
<br />baekfil7, s/h.i.c}, could result in rni.lnrc of the L.~c?r;~llied pit srr'f..ce. If
<br />this possibility cannot 1_%c r!iscounter? ];;l the agolicturt, tiro pager !::zir~s should
<br />be pz'operLr sealed with impermcabie overburden :nuteriaJ.s prior to ba::Y.f~ii.iiny
<br />of the contour pit.
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