REV09878 - Laserfiche WebLink

Home Browse Search

Septen2xr2004 BTUErryiieGnpn"aaa= *LiaGrliryRdaueApµ'ecaian ~ Pa~e3 2.0 LIABILITY RELEASE REQUEST 2.1 LIABILITY RELEASE AREAS Release of liabihty for surface subsidence effects due to underground mining is requested for approximately 665 acres overlying the 5 Mine workings to the west of State Htgltway 13. The proposed liability release area, as delineated on Map 1, does not include any alluvial valley floors, croplands, or prime farmlands. Table 1, Eagle No. 5 Mine - Liabihty Release Areas, provides a legal description of the subject lands. TABLE 1 EAGLE NO. 5 MINE -LIABILITY RELEASE AREAS Liability Release Area Approx. Acres Within Permit T6N, R91 W, Section 31 SW'kNW'/a 44 W'/zW'hSE'kNW'k 13 SW'kSW'kNW'/aNW'k 4 a portion of the NW'kSW'/a 29 a portion of the W'/zWYzNE'kSWYa 8 a portion of the W%zSWYaSW'k 20 a ortion of the NE'kSW'k 2 T6N, R92W, Section 25 S''/zSE'k 81 S%zN'/sSE',4 20 SE'/aSW'k 40 E'/zSWYaSW'k 20 SYzN'/zNE'/aSW'/a 10 S'/zN'/zE'hNW'/aSW Ya 5 T6N, R92W, Section 35 E'/z E'/zNE'/a 39 E'/zNEYaSE'k 18 T6N, R92W, Section 36 N'/z less areas outside the permit boundary in the NEYa 180 NYzSW'k 82 TOTAL 615 2.2 DOCUMENTATION FOR LIABILITY RELEASE Mining operations in the 5 Mine on the west side of State Iirghway 13 were generally limited to advance room and pillar mining with very limited retreat mining, so pillars of coal remained behind following completion of mining, to suppor the mine roof. Conversations with individuals familiar with the 5 Mine operations indicate that the combination of geologic condtions and a massive competent overlying sandstone unit resulted in very good roof conditions during mining, limiting requirements for roof bohing and other ground control measures. Given that the westem portion of the 5 Mine was developed and operated during the eazly 1970's through the early- to mid-1980's, current subsidence evaluation and monitoring requirements were not y,'t in place. Consequently, little or no subsidence documentation is available for this area. Based, however, on both historic descriptions and recent visual inspections, little or no visible surface subsidence has occurred over the 5 Mine western workings. Normally, surface subsidence associated with underground coal mines occurs within 3 months to 3 }ears of undermining, with little or no subsidence occurring after 5 }eats. In this case, little or no surface subsidence has been observed over the 5 Mine western workings; no mining has occurred in this area in approximately 19 years, and it is approximately 14 years beyond the normal maximum period for subsidence to occur. B7Z1 E rryire Crnpuradcn * 29515 RCR 27 CLk C~z, 0080467 * (970J 870-2712 urn. at ~,~.noH c:tsird.~.e~ anaid~ Reussl - Ordxr 2004