2023-04-19_PERMIT FILE - C1981010A (13)

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Coal Stockpiles Trapper Mine has one small coal stockpile available to employees in which a relatively small amount of coal is stored and is frequently removed. The current employee coal stockpile is located along the Colt pit haulroad draining into No -Name Gulch. Future employee coal stockpile relocation will warrant correspondence and an appropriate map (M13A) to the Division during the calendar year of stockpile relocation. A second coal stockpile constructed adjacent to the Life of Mine haulroad in the Johnson Gulch area will be used to store coal produced at the mine. This pile will be used during time periods in which the crusher equipment is being repaired at the adjacent Craig Station, or when excess coal is produced and it is used as a surge pile. Drainage will be contained with perimeter ditches that flow to dozer basins at the end of each ditch. Drainage ditches will be constructed in accordance Appendix Q, Section XVII, Temporary Diversion Design and dozer basins will constructed in accordance with Permit Section 4.8.1.7. Overflow drainage will flow to the Johnson and West Pyeatt Gulches. Drainage from all coal stockpiles ultimately flows through sedimentation control structures, as discussed in Permit Section 4.8. Dragline Repair Pads In 1990, Trapper replaced the tub assembly on the Queen Anne dragline located in B/C pit. To accom- modate this effort, a pad was constructed to facilitate contractor and Trapper employee working space. The tub pad was constructed at the intersection of our B/C pit haulroad near an existing ANFO silo (Map M13A). The pad encompassed approximately three acres. A 70 -ft x 70 -ft, 8 -inch thick concrete pad was constructed within the three -acre area. This concrete pad was converted to a waste oil and anti- freeze accumulation site in 1994. In 1998, Trapper replaced the tub assembly on the Molly Brown dragline located in Derringer pit. The site configuration was the same as that used in 1990 for the Queen Anne project. The entire tub assembly site was located within existing Derringer pit disturbance. In 2005, Trapper replaced the tub on the Baby Doe dragline. A pad was constructed in an already disturbed area just north of the life -of -mine road near G pit. The project site configuration is the same as that used for the prior two tub replacements 3.8.2 Utilities (Trapper Mine) Powerlines and Substations The powerlines that deliver power to the draglines are rated at 69 KVA. The voltage is reduced to the required voltage for each machine at portable substations in the field. These lines and substations are currently in good condition and are inspected regularly. The power lines and substations require movement as the pits progress. The substations are moved several times a year and consequently are not shown on the maps. Each substation pad has topsoil removed before a substation is moved onto it. The topsoil is replaced when the pad is no longer needed. The power distribution system is shown on Map M13A. Revision: 3-184 Approved