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RULE 2 PERMITS <br />Electrical Conductivity <br />Greater than 12 millimhos/cm <br />Sodium Absorption Ratio <br />Greater than 15 <br />The laboratory results are kept at the mine site. Results of the sampling program are provided in <br />the appropriate Annual Reclamation Report and are periodically checked during DRMS quarterly <br />complete inspections. <br />If the results of the sampling indicate that one or more of the parameter suspect levels is reached, <br />the Division will be contacted. At that point, Colowyo, will resample the area to determine the <br />extent of the <br />suspect material. If the problem area is greater than one acre in size, it will be necessary to cover <br />the area with at least five feet of acceptable material before the application of topsoil. <br />After removal of the overburden, the coal seams are exposed. As the coal seams are exposed, they <br />are cleaned using auxiliary equipment then either drilled and shot with explosives or ripped to <br />prepare the coal for loading and removal. <br />When explosives are needed, the drilling is performed by an auger drill. The drilling pattern is in <br />the range of 12 feet by 12 feet, but is dependent upon the actual coal seam thickness. Drill holes <br />are loaded with either ANFO or a waterproof explosive. <br />When the coal is ripped rather than shot, large bulldozers with ripper attachments will fragment <br />the coal sufficiently for smooth loading operations. <br />Once the coal has been prepared for loading by either blasting or ripping, a rubber -tired front-end <br />loader loads the coal into haulage trucks. Following loading, these haulage trucks transport the <br />coal along in pit roads to the primary crusher located just outside of the mining area as shown on <br />the Existing Structures - South Map (Map 22). <br />In order to visualize the overall mine plan, a range diagram was drawn. This diagram is found as <br />Mining Range Diagram (Map 24) and depicts operations by draglines in combination with shovels <br />and trucks. The past and anticipated annual production tonnage of coal is shown in Table 2.05-2, <br />Historic and Anticipated Annual Coal Production. <br />Coal to be mined at he Colowyo operation is present in at least 8 separate seams ranging in <br />thickness from 2 feet to 15 feet. The seams to be mined are designated from upper most to lowest <br />as Y (Y3 and Y2), X, A (Al, A2 and A3), B (B1 and 132), C, D (Dl and 132), E, and F. To date, <br />very little of the Y2, Y3 and A3 seams have been recoverable. <br />Coal from the mining area is transported to a coal crushing facility as shown on the Existing <br />Structures - South Map (Map 22). Details of the coal crushing and load -out facilities are included <br />in Section 2.05.3 under the heading of Mine Facilities. <br />After coal recovery by conventional truck/shovel and dragline methods has reached the maximum <br />economical recovery limit, Colowyo has the potential of using a highwall miner when the <br />conditions allow. The highwall miner can recovery additional reserves left in the pit face that were <br />Rule 2 Permits 2.05-4 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />