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<br />h'xc~~rpt: Bear Coal <br />_;i_ <br />;;XII. Suisic?~ncc - P.ulas ?.r)5.~:(~;) and •?.20 <br />Findings Document <br />Mini ng within the Bear No. 1 and eo. 2 mines wi 11 be curtailed no ~la ter than the early <br />suncner of 1982. Therefore, the approval of a subsidence control plan is considered <br />unnecessary at this stage in time, because little additional disturbance is projected <br />Co occur outside the areas which have already been previously undermined by the Bear <br />Coal Company. In the case of proposcrl mining within the Bear No. 3 mine; the applicant <br />must conform Wlth the requirements of the permanent program regalati.ons regarding <br />subsidence control. No structures overlie the underground workings of the Dear No. 3 <br />mine. In adrl.itinn, potenCiaiI~l affected rer.c~•oable resource ]ands arc Iimited to <br />the aquifers of the Darren h!emb-•r of the Nesu Verde and the codZ scams overlying the <br />seam to be c::trac•ted within tha Dear No. 3 mine. 1lowevcr, l:1re limited area of these <br />potentially affected aquifers iJt:ich occur within the permit area, and the fact that <br />potential effects to these aquifers are limited to the down-dip, near-outcrop portions <br />of those aquifers and coal seas::, ::•iI1 extremely limit the possible hydrologic effects <br />of subsidence upon this ayuifc-r and the coal seams. Therefore, the proposed mining <br />within the Scar rJo. 3 mine is con.~.irlez'ed, by the Division, to represent no potential <br />threat to c-ithr-r structures or renewable resource lands. <br />1laJever, mapping of the Somarset quadrangle, performed Ly Rahe Junge of the Colorado <br />Geological Survcu, has detcrmir:cd that the mujo.rity of the surface area above the <br />Dear No. 3 mire permit area is veneered by ancient and modern landslide deposits. <br />In addition, a geotechnical incestiyation performed by Rocky 1•fountain Geotechnical, <br />Ir,c., for Bear Coal Companu has confirmed the existence of ancient and modern landslide <br />deposits adjoining the areas of the proposed portalacccss road anc7 portal facilities <br />fnr the Scar h.'o. 3 nine. The stability of these ancient and modern landslide deposits <br />could be affected by rliffezrntial :nlrfacr_ subsidence, if it were to occur, above the <br />Lear Nu. 3 mine mot}sings. .1lthour~h the Dcar Coal Company Iimjects no surface indications <br />of subsidence wi.11 occur ::'itAin these areas, the Division considers the follaJing <br />stipulation necessary to find compliance with the subsidence requirements of the <br />permanent program regulations. ' <br />sTlPUZ:,TrorJ No. ls: <br />THE DIVIS'70?1 DIP. L'CTS lJL'. ~' CC.iL COh1PA1J}' 1'O SUDJdIT A SUBSIDENCE hIONITORING PROGRAM <br />FOR REVIEFJ AND APPRO VA I. BY THE DI VISIO!!. TIfIS PP.OGIW h1 SIfALL INCLUllE TFIF. <br />7fJ3TALLATZO;J OF APPP.O.°RIATC PROFILE LINES OF PERhIANEPIT h10N UMEIJTS, CAPABLE OF <br />RESIS TIIJG ,VORJ•li,L TRAFFIC A?7D idETEOROLOCIG1L P}/EJ7 Gh1EiJA. A10NUh1F.IJTS SHALL BE <br />117CATED TO rd0^JITOR POSSIBLE SUBSIDENCE OF AREAS DESIGC'ATED FOR THE INITIi,TION <br />OF RETREAT OR S'EC0,1'D~J23' EXTRACTION. T11ESE PLAITS STALL INCLUDE A TYPICAL <br />iVO 'U.'•IEilT DETAIL DP.A?:'IiJC. Ti17S SUBSIDE:'JCE h!OiJITORINC Pf.'OGRAhJ SHAlh BE SUDMITTED, <br />FO,R .REVIEhJ DY T11£ DIVISIO.'l, NI TIlIN 30 DAYS FOLI.O(•JINC PERMIT APPROVAL. <br />FURTHER, T11E APPROVED .S UDSI DElICE h!ONITORI,VG hIONU?LENTS SJJALL BE IA'STALLED AND <br />IIlITIALLY ,+IOJJZTORCD PP.SOP. TO Tf1E COJ4h1EPJCEh1Eh.'T OP RETREAT OR SECONDARY EXTRACTION <br />!:'ITfIIiJ THC BEAR rJO. J i~: f~li_'. J'OLLOI:2NG' T1JE IIJITIAL h1ONITORINC, TJIG SUDSIDENCE <br />f!O:lUF: E!!TS Sf!ALL DE hIO;II'fOR!iD ON .l SE~~17-i+MNUAL 3i4SIS, AND Tl(E P.PSULTS OC TF1AT <br />F:GiIITOR IIJC STALL LE SUB:dITTL'D TO TJ!E DIVZSIO!i 1:'ITf/IN 30 DAYS FOLLO [DING' COhfPLET.IOrl <br />OF E.>;CH :<G:!ITORIYG S!JR'VL:'. <br />