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1 <br /> RULE 2 PERMITS <br /> Collom Pit is approximately 7 bcy per ton. Normal bench dimensions and heights as described in the <br /> ground control plan will be used. Table 2.05.2-3 presents the estimated yearly production. <br /> A general description of the initiation of mining activities in the Collom Pit is described below: <br /> Sediment Control System Construction: <br /> To begin with,Colowyo will construct some temporary sediment control measures(please see Exhibit 23, <br /> Item 7, Part H), while construction of the downstream sediment control ponds and perimeter ditches <br /> around the temporary spoil pile are being constructed to establish sediment control in the area. (See <br /> drawings Exh. 7-23, Figure C4 and Exh. 7-23, Figure C9 for location and layout of the sediment control <br /> ponds.) <br /> Collom Pit and Temporary Spoil Pile: <br /> Topsoil stripping will commence for the initial box cut area and temporary spoil pile once the temporary <br /> sediment control measure area constructed. These areas are depicted on Map 23B. Construction of the <br /> temporary spoil pile underdrain will then commence in the valley bottom progressing upstream from the <br /> southernmost limit of the temporary spoil pile and progressing downstream toward the final toe of the <br /> temporaroy spoil pile. (See profile A-A' on Map 29C). Initial construction of the toe of the temporary <br /> spoil pile(northern extent)will commence concurrently with boxcut development. <br /> For development of the intial box cut of the Collom Pit, Colowyo will utilize truck/shovel techniques. <br /> Mining will be conducted in an up-dip direction. (north to south). Please refer to Table 2.05.6-5 for <br /> specific volumetric information on overburden and coal including swell factor effects. <br /> Please refer to Volume 1, Section 2.05.3 for blasting procedures and sequencing information applicable to <br /> the Collom expansion area activities. Please also refer to Section 4.08 of this package for additional <br /> information. <br /> Once the overburden is sufficiently fragmented to allow for efficient removal and loading, overburden <br /> will be loaded and transported to the temporary out-of-pit spoil stockpile or to adjoining mined-out areas <br /> within the pit. After removal of the overburden, the coal seams will be exposed. As the coal seams are <br /> exposed, they will be cleaned using auxiliary equipment, then either drilled and shot with explosives, or <br /> ripped to prepare the coal for loading and removal. <br /> When explosives are needed, the drilling will be performed by an auger drill. The drill hole pattern is <br /> generally spaced approximately 12 feet by 12 feet,though dependent upon the actual coal seam thickness. <br /> Drill holes will be loaded with either ANFO or a waterproof explosive (if the holes are wet), to a typical <br /> powder factor of about 0.2 pounds per ton. <br /> Once the coal has been prepared for loading by blasting or ripping, a rubber-tired front-end loader or <br /> excavator will load the coal into haulage trucks. Following loading,these haulage trucks will transport the <br /> coal along in pit haulage routes to the primary crusher located just outside of the pit, as shown on Map <br /> 25D(Collom Haul Roads). Coal from the primary crusher will be loaded into trucks and transported on a <br /> paved haulage road (See Map 25E — Collom Haul Road, Sheets 1-4) to the coal crushing and load-out <br /> facility at the Colowyo permit area as shown on the Structures and Facilities Map (Volume 8, Map 22). <br /> Details of the coal crushing and load-out facilities are included in Volume 1, Section 2.05.3 under the <br /> heading of Mine Facilities. <br /> Collom—Rule 2, Page 73 Revision Date: 3/19/18 <br /> Revision No.: TR-118 <br />