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Grading Map (Map 29)). The west half of the coal lease will be mined from north to south. The initial mining in Section 15 and 16 will be "X" seam only. Mining will start on the east and west and progress toward the ridge in the middle of Section 16. Later, a portion of the west pit will progress into the northern portion of Section 16. The estimate of the cost of reclamation of the proposed operations required to be covered by the performance bond is found under Rule 3. As discussed in detail in Section 2.05.3, the mining method proposed by Colowyo is referred to as open-pit multiple seam/single seam dragline mining. The overburden material from the initial boxcut area was deposited in the Streeter Fill. As the mining progresses to the south, overburden material from each successive cut will be backfilled into the previously mined out area. This cycle will be repeated for the entire mining area. Because an open-pit mining technique is employed, the regrading and backfilling of the spoil material will be as contemporaneous as possible behind the mined-out area to facilitate proper leveling of • the overburden material. The mining techniques utilizing dragline and truck/shovel operation are shown in detail on Mining Range Diagram (Map 24), and show the approximate distance between topsoil removal and replacement. The backfilled mining areas will approximate original contour and to areas outside the mining limits. slopes so that overall grades do information on the backfilling and further in Section 2.05.3 and Secti be graded to establish the blend in with the undisturbed Colowyo will grade all final not exceed 33~. Additional regrading plan are discussed ~n 4.14. Where necessary, the spoil surface will be roughened by ripping or discing etc., to ensure a bond between the topsoil and spoil to reduce slippage. To date there is no evidence of topsoil slippage on reclaimed areas. A few small tension cracks resulting from settling of fill and topsoil have occurred in a few areas within a year or two after reclamation, but soon stabilize and begin to fill in. 2.05-40