2020-06-25_REVISION - C1981019 (6)

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RULE 2 PERMITS A general description of the initiation of mining activities in the Collom Pit is described below: Sediment Control System Construction: To begin with, Colowyo will construct some temporary sediment control measures (please see Exhibit 23, Item 7, Part H), while construction of the downstream sediment control ponds and perimeter ditches around the temporary spoil pile are being constructed in order to establish sediment control in the area. (See drawings Exh. 7-23, Figure C4 and Exh. 7-23, Figure C9 for location and layout of the sediment control ponds.) Collom Pit and Temporary Spoil Pile: Topsoil stripping will commence for the initial box cut area and temporary spoil pile once the temporary sediment control measure area constructed. These areas are depicted on Map 23B. Construction of the temporary spoil pile underdrain will then commence in the valley bottom progressing upstream from the southernmost limit of the temporary spoil pile and progressing downstream toward the final toe of the temporaroy spoil pile. (See profile A-A' on Map 29C). Initial construction of the toe of the temporary spoil pile (northern extent)will commence concurrently with boxcut development. For development of the intial box cut of the Collom Pit, Colowyo will utilize truck/shovel techniques. Mining will be conducted in an up-dip direction. (north to south). Please refer to Table 2.05.6-5 for specific volumetric information on overburden and coal including swell factor effects. Please refer to Volume 1, Section 2.05.3 for blasting procedures and sequencing information applicable to the Collom expansion area activities. Please also refer to Section 4.08 of this package for additional information. Once the overburden is sufficiently fragmented to allow for efficient removal and loading, overburden will be loaded and transported to the temporary out-of-pit spoil stockpile or to adjoining mined-out areas within the pit. After removal of the overburden, the coal seams will be exposed. As the coal seams are exposed, they will be cleaned using auxiliary equipment, then either drilled and shot with explosives, or ripped to prepare the coal for loading and removal. When explosives are needed, the drilling will be performed by an auger drill. The drill hole pattern is generally spaced approximately 12 feet by 12 feet,though dependent upon the actual coal seam thickness. Drill holes will be loaded with either ANFO or a waterproof explosive (if the holes are wet). Once the coal has been prepared for loading by blasting or ripping, a rubber-tired front-end loader or excavator will load the coal into haulage trucks. Following loading,these haulage trucks will transport the coal along in pit haulage routes to the primary crusher located just outside of the pit, as shown on Map 25D (Collom Haul Roads). Coal from the primary crusher will be loaded into trucks and transported on a paved haulage road (See Map 25E — Collom Haul Road, Sheets 1-4) to the coal crushing and load-out facility at the Colowyo permit area as shown on the Structures and Facilities Map (Volume 8, Map 22). Details of the coal crushing and load-out facilities are included in Volume 1, Section 2.05.3 under the heading of Mine Facilities. As the temporary overburden stockpile is constructed, best management practices to reduce sediment production and excess dust impacts to adjoining areas will be implemented. Interim reclamation and/or dust suppression chemcials maybe utilized to impacts, if determined to be necessary. Collom—Rule 2,Page 72 Revision Date: 6/22/20 Revision No.: MR-220