2025-04-08_PERMIT FILE - C1981019A

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RULE 2 PERMITS 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, scrapers, and bulldozers since the operation has reached a"steady state". 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 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. Following the completion of mining,temporary overburden stockpiles will be removed and placed back into the open pit. Specifically,the top 75 feet of the temporary overburden stockpile known as "Hink's Peak"will follow this same removal and replacement within the north end of the West Pit. This will be performed by removing the Bucyrus 1300W Dragline (102) out of the West Pit Mining Sequence and walking it north into North Taylor draw and onto "Hink's Peak" via previously constructed lifts. Dozers will assist the dragline in grading this temporary overburden pile and the surrounding tail-dump areas of the West Pit. The final grade of the slopes will approximate the pre-mining topography(See Pre-mining Topography Map(Map 18),Post-mining Topography Map (Map 19) and Pre-mining and Post-mining Cross Sections (Map 20)). 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 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 Table 2.05-3, Equipment List. Operation Description A detailed narrative description of the land to be affected within the permit area is provided' above under the heading Production Methods and Equipment. Historically mined areas are shown on Map 23, and current mining areas are shown on Map 23A and 23B. The various acreages affected by the mine operation are shown in Section 2.03 on Table 2.03-1 Please see Volumes 12 and 15 for a description of current operations. Mine Facilities The existing buildings, structures, utility corridors and other facilities are shown on the Existing Structures -North Map (Map 22) and Existing Structures - South Area(Map 22B). Colowyo has the following major structures located in the permit area office; shop and warehouse facility; coal crushing and loadout facilities; explosives bunker; sedimentation ponds; utility lines; water lines; and haul roads. Rule 2 Permits 2.05-5 Revision Date: 12/20/19 Revision No.: TR-135