2020-06-25_REVISION - C1981019 (6)

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RULE 2 PERMITS recoverable by conventional surface mining methods. This new highwall miner technology can recover coal up to 1600 feet in advance of the final pit walls with an approximate coal recovery ratio of 40%to 60%. Once the coal has been recovered and stockpiled in the pit, then the coal will be transported to the primary crusher and train loadout by coal haul trucks. Refer to Map 23A for the location of potential highwall mining areas. As soon as possible after the coal is removed from the mining area and sufficient room is available for back-filling, reclamation begins. In general, rough backfilling is completed by the over-burden trucks and bulldozers. As stated earlier, overburden material removed ahead of the operation is transported by truck around the active coal mining areas and deposited into the mined-out and stockpile areas. A dragline may also be utilized on the backfill material to assist in final spoil placement and in achievement of the planned final topography. Final grading for topsoil placement will be done in a manner that reduces erosion and provides a surface for topsoil that minimizes slippage. Prior to completion of topsoil replacement on 3:1 (horizontal to vertical) slopes, a dozer will construct a drainage control bench or furrow, where necessary, to slow water flow on the longer slopes and minimize erosion. The design Calculations for the benches and furrows are found in Exhibit 7, Hydrology Information. At the completion of the final grading, topsoil will be redistributed over the regraded spoil and revegetated in accordance with Volume 1, Section 2.05.4. Other surface treatments are also described in Volume 1, section 2.05.4. A list of the equipment used by Colowyo in order to perform the day-to-day operation of coal mining is shown in Volume 1, Table 2.05- 3. 2.05.3 (2) Operation Description A detailed narrative description of the land to be affected within the South Taylor area is provided above under the heading Production Methods and Equipment. The mining plan for South Taylor is graphically portrayed on the Mine Plan Map (Map 23A). The various acreages to be affected by the planned mine operation are shown in Volume 1, Section 2.03 on Table 1, Affected Areas for Mining and Reclamation. The details of these operations for South Taylor are shown on the Mining Range Diagram(Map 2413). The lines on Map 23A refer to coal seam mining, the lines on Map 28, Topsoil Handling, refer to the anticipated overall disturbance that not only includes coal mining, but also associated perimeter disturbances as well. 2.05.3 (3) Mine Facilities The existing buildings, structures, utility corridors and other facilities are shown on the Existing Structures - North Map (Map 21), Existing Structures - South Area (Map 22) and Existing Structures — South Taylor Area (Map 22A). Colowyo only anticipates the need for a minimal amount of major structures within the South Taylor area, which will include the installation of utility lines, water lines and in-pit haulage routes. No out of pit haul roads are anticipated. All other support facilities are located on maps 21 and 22,which will continue to be used for the life of mine. Please refer to Volume 1, Section 2.05 for a complete description of Operational procedures within the permit boundary including the South Taylor area. South Taylor/Lower Wilson—Rule 2,Page 70 Revision Date: 6/22/20 Revision No.: MR-220