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When the coal is ripped rather than shot, large bulldozers with ripper attachments will <br />fragment the coal sufficiently for smooth loading operations. <br />Once the coal has been prepared for loading by either blasting or ripping, arubber-tired front- <br />end loader loads the coal into haulage trucks. Following loading, these haulage trucks <br />transport the coal along in pit roads to the primary crusher located just outside of the mining <br />area as shown on 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 <br />as Mining Range Diagram (Map 24) and depicts operations by draglines in combination with <br />shovels and trucks. The past and anticipated annual production tonnage of coal is shown in <br />Table 3, 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 l5 feet. The seams to be mined are designated from upper most to <br />lowest as Y (Y3 and Y2), X, A (A-, A2 and A3), B (Bi and B2), C, D (Dl and D2), E, and F. <br />To date, 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 <br />included in Section 2.05.3 under the heading of Mine Facilities. <br />As soon as possible after the coal is removed from the mining area and sufficient room is <br />available for back-filling, reclamation begins. [n general, rough backfilling is completed by <br />the over- burden trucks and bulldozers since the operation has reached a "steady state, " as <br />shown on the Mining Range Diagram (Map 24). As stated earlier, overburden material <br />removed ahead of the operation is transported by truck around the active coal mining areas <br />and deposited into the mined-out areas. Either dragline may periodically be utilized on the <br />backfill material to assist in final spoil placement and in achievement of the planned final <br />topography. The final grade of the slopes will approximate the pre-mining <br /> <br />2.05-10 Revision Date: 8/29/97 <br />Revision No.: TR-42 <br />