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When the coal is ripped rather than shot, large bulldozers with ripper <br />.' attachments will fragment the coal sufficiently for smooth loading <br />operations. <br />Once the coal has been prepared for loading by either blasting or <br />ripping, a rubber-tired front-end loader loads the coal into haulage <br />trucks. Following loading, these haulage trucks transport the coal along <br />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. <br />This diagram is found as Mining Range Diagram (Map 24) and depicts <br />operations by draglines in combination with shovels and trucks. The past <br />and anticipated annual production tonnage of coal is shown in Table 3, <br />Historic and Anticipated Annual Coal Production. <br />Coal to be mined at the Colowyo operation is present in at least e <br />separate seams ranging in thickness from 2 feet to 15 feet. The seams <br />to be mined are designated from upper most to lowest as Y (Y3 and Y2), <br />X, A (A1, A2 and A3) , B (B1 and H2.) , C, D (D1 and D2) , E, and F. To <br />• 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 <br />shown on the Existing Structures - South Map (Map 22). Details of the <br />coal crushing and load-out facilities are included in Section 2.05.3 <br />under the heading of Mine Facilities. <br />As soon as possible after the coal is removed from the mining area and <br />sufficient room is available for back-filling, reclamation begins. In <br />general, rough backfilling is completed by the over- burden trucks and <br />bulldozers since the operation has reached a "steady state," as shown on <br />the Mining Range Diagram (Map 24). As stated earlier, overburden <br />material removed ahead of the operation is transported by truck around <br />the active coal mining areas and deposited into the mined-out areas. <br />Either dragline may periodically be utilized on the backfill material to <br />assist in final spoil placement and in achievement of the planned final <br />topography. The final grade of the slopes will approximate the pre- <br />mining <br /> <br />2.05-10 <br />Fievizio~ i.~revetr 4 ~~ z ~G IZ <br />Revision:Jo. ~ ~ 7 <br />