Laserfiche WebLink
• mining advances into the final pit, the working area on the pit spoil side tivill decrease to a point <br />where insufficient spoil room below the proposed postmining contours is available. When that <br />point is reached, material will be temporarily placed above the proposed postmining topography. <br />When the final pass of the lyest Pit is mined out, this temporarily-placed spoil will be rehandled <br />concurrently with Section 16 virgin and rehandle material to fill and slope the pit to the <br />configuration shown on Map 19 (Postmining Topography). Because the area will be redisturbed <br />by the rehandle activities, that portion of the north end of Section 16 that is above final grade will <br />not be topsoiled or otherwise reclaimed until final reclamation. <br />In addition, Colowyo controls additional coal reserves west and south of Section 9 and 16, <br />outside of Permit C-81-019, that may be considered for future mine expansion. It is possible that <br />the final plans for Section 16 and Section 9 could change to provide for such expansion, with any <br />plan changes being addressed through an appropriate permit revision. <br />4.14.2 General Grading Requirements <br />The final graded slopes at the mining operation will not exceed the approximate original <br />premining slope grade as shown on the Postmining Topography Map (Map 19). Colowyo will <br />retain all overburden and spoil material on solid portions of existing or new benches. The final <br />highwall at the operation will be eliminated by backfil(ing overburden into the final pit area. <br />Small depressions of a holding capacity slightly greater than one cubic yard of water may be used <br />to create a moist micro climate to aid in shrub establishment. See Section 2.05.4, Planting and <br />Seedings Methods for further information regarding these small depressions. Also, several stock <br />• watering ponds will be constructed to compliment the postmining land use. Providing a supply of <br />water is an integral paR of the grazing postmining land use. Colowyo will not be mining on any <br />slopes above 20° as shown on the Premining Topography Map (Map 18). <br />Final grading before topsoil placement will be conducted in a manner that minimizes erosion and <br />provides a surface for the topsoil that minimizes slippage. Final grading will be accomplished so <br />that overall grades will not exceed Iv:3h. The plan for backfilling and grading is shown <br />graphically on the Spoil Grading Map (Map 29). <br />4.14.3 Covering Coal and Acid and Toxic Forming Materials <br />Colowyo will not have any exposed coal seams remaining at the end of mining and reclamation. <br />Colowyo does not have any acid forming materials at the mine. For discussion on acid- and <br />toxic-forming materials, refer to Section 2.04.6. For disposal of noncoal wastes or materials <br />constituting a fire hazard, refer [o Section 4.11.4. <br />u <br />4.14-4 Revision Date: 5/8/03 <br />Revision No.: TR-56 <br />