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• TAB 20 <br />BACKFILLING AND GRADING <br />Backfilling~ n3 d Grading Met_nodc_, Mining and backfilling operations at Nucla Mine will be <br />performed concurrently. Scrapers will remove the overburden and parting materials, then haul <br />the material to a previously mined area to be backfilled. Initially in Areas No. 1 and 2, some <br />overburden material will be temporarily stockpiled outside of the mined pits onto previously <br />mined lands but will later be hauled back to or graded into mined area to achieve the final land <br />form. The existing rough graded spoil in the western part of Area No. 1 will also be hauled or <br />pushed into a mined area and graded to the approximate topographic form shown on Exhibit 20- <br />3. <br />Upon completion of the backfilling, all highwalls and depressions larger than one cubic yard will <br />be eliminated. All areas disturbed by mining will be graded to the approximate landfomt shown <br />on Exhibits 20-3 and 20-10. <br />Final Graded Slop. Postmining slopes will not be uniform but will approximate the general <br />nature of the premining topography. All highwalls will be eliminated and graded to a 5:1 slope or <br />• flatter. <br />T "rrarec. Terracing in the final reclamation is not proposed at the Nucla Mine. <br />mall D nressions. Small depressions are not proposed at the Nucla Mine. See Exhibits 20-3 <br />and 20-10 for the postmining topography. <br />to loo -c. Nucla Mine does not have steep sbpes as defined in the regulations. <br />Final Grading. Final grading and preparation of the backfilled material before placement of <br />topsoil material will be done along the contour to minimize subsequent erosion and instability. If <br />such grading is hazardous to equipment operators, then grading will be done in a direction other <br />than generally parallel to the contour. <br />Final Pit Rackfilline. In order to eliminate any final highwalls and to achieve the approximate <br />original landfonrt, some highwall material will be pushed or dozed into the mined area. Exhibits <br />20-4 and 20-11 show typical cross sections of the fill material placed into the mined pits. <br />Material above the final highwall may be blasted or ripped and then graded to blend into the <br />surrounding topography. <br />• <br />20-1 <br />