2022-04-08_PERMIT FILE - C1981044 (4)

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2.05.6(6) SUBSIDENCE MONITORING, SUBSIDENCE SURVEY AND SUBSIDENCE CONTROL PLAN These sections present the necessary subsidence information required by the CMLRD for MCM's Williams Fork Mines. An inventory of all structures and renewable resource lands in the permit area has been performed, and a determination of material damage or diminution of use for areas of planned mining has been incorporated herewith. A subsidence control plan and a limited subsidence monitoring program are presented for the appropriate mining areas. An inventory of all structures and renewable resource lands is presented on Table 78, Inventory of Structures and Renewable Resource Lands. The locations of all structures and renewable resource lands are shown graphically on the Structures and Renewable Resources Map (Map 25). Active mining ceased in 1995 and no future mining is planned or proposed. Map 24 shows the previously mined areas of the No. 5 Mine as a green outline, the completed Mine No 6 development and mining in red, and the previously planned Mine no. 6 development and mining as shaded red lines and blocks. Structures The following structures have been identified within and adjacent to the Permit Area: • Mine Facilities(not undermined) • Mine Facilities(presently undermined) • Mine Facilities(to be undermined) • Private Residences(houses) • Oil Pipeline • County Road 107 • State Highway 13 • Railroad • Irrigation Ditches Mine Facilities (Not Undermined). The mine facilities located at or adjacent to the No. 5, No. 5A, and No. 9 portals have not been undermined. The structures in the these areas include mine portals, bathhouses, ventilation fans, storage buildings, and utilities as well as coal transport, preparation, and storage facilities. All mine facilities have been discussed in detail in Section 2.05.3, Operation Plan. Mine Facilities (Undermined). The mine facilities within the permit area that have been undermined include mine access roads, powerlines, water lines, railroad spur, coal storage silo, and coal conveying system. These facilities are located over development entries (mains and sub-mains) which are designed to remain stable for the life of the mine. These facilities have been protected against subsidence damage by assuring that sufficient coal was left in-place to prevent or minimize subsidence in the area. In addition, areas of Trapper Mining, Inc.'s surface mining operation which have been previously mined and reclaimed have been partially undermined. The Trapper Mining reclaimed areas that have been undermined including reclaimed mine areas,two topsoil stockpiles, an access road leading to the topsoil stockpiles, and several small stock ponds were undermined without any material damage. Mine Facilities (Previouslyposed to be Undermined). The mine facilities under which proposed mining would have been conducted include MGM's underground F-Seam and P-Seam workings. Mining undermined underground mine workings in the No. 5 Mine, however, none of the No. 9 Mine workings have been undermined to date, and no future mining is planned, so potential impacts are limited to those that have already occurred. The MCM surface facilities that would have been undermined include Sedimentation Ponds SH-P1, SH-P2 and the associated Old Shop and storage area and the Storage and wood shop (both reclaimed in 2008), a rock dust tank(removed), the contractor staging area, ,and the Okie Plaza Well. Private Residences (Houses). There are three-(3) private residences located within the Permit Area. They are located as follows: (1)NE/4 of the SE/4 of Section 30,T6N, R91 W, (2) SE/4 of the NEA of Section 29,T6N,R91 W, and(3) W'/Z of the W'/z of Section 29, T6N, R91 W. These structures are located within the proposed life-of-mine area, however, since the last mining occurred in the 4-East Panel and no future mining is planned, all residences are well outside of the angle of draw for the mining completed to date, and will not be impacted. RN18-07 2.05-48 Revised 10/19/18