2017-12-20_REVISION - M1977219 - Laserfiche WebLink

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EXHIBIT L RECLAMATION COSTS This reclamation cost estimate in based on the assumption that no more then 40 . 0 acres will need some form of reclamation at any one time . Of this 40 acres, approximately 30 . 0 acres would be stripped, active mining and processing areas and the remaining 10 . 0 acres would be, partially reclaimed area. This is based on a worse case scenario i .e . , at a time when the greatest area will need some form of reclamation as shown on Map Exhibit C-1 Mining Plan Map. The plan allows for 1000 linear feet of bank sloping to backfill grade the mining face from near vertical to 3h to lv as proposed in the Reclamation Plan. The mining face has 3 zones of which one, the sandstone layer (zone 2) The rock face in zone 2 will be backfilled against using material generated by mining (61 . 96 yd/ft) . The other 2 zones are unconsolidated material with the top most (zone 1) being topsoil and overburden and the clay layer (zone 3) . Zones 1 sloping will be done using a cut/fill (1 . 31 cy/lft) method where the upper part is dozed into the lower part . In zone 3 a backfill method (5 . 25 cy/lft) will be used by either pushing material up against the working face or backfilling against the face to create the 3h to lv slope . In Zone 1 the volume of dirt needed to do the cut/fill sloping is based on a depth of 9 feet or 1, 310 cyd/lft and in Zone 3 backfilling is based on a clay seam average depth of 10 feet or 5, 250 cyd. In Zone 2 the volume of fill needed will be 61, 960 yards on an average of 35 high backfill area. Included is a cost to place 6 inches of overburden root zone on the seedbed, 24, 200 yards, and replace an average of 3 inches of topsoil or 12 , 100 cubic yards of topsoil on the 30 acres disturbed. The revegetation cost figure includes fertilizer, grass seed, mulch and drilling costs . A 627C Cat motor scraper will be used to place the root zone, resoil the area and place backfill material in Zone 3 . A 140G Cat motor grader will be used to shape the seedbed, the slopes and the resoiled areas . We have included the cost to reduce the working face highwall using a D8U Cat dozer from near vertical to 3 : 1 if mining ends prematurely. The table below outlines the various areas of disturbance under this scenario. These figures are then used in the calculations for the bond amount . ACTIVITY TOTAL SOIL DEPTH NEEDS RESOILING 30 . 0 AC 3 " ROOT ZONE PLACEMENT 30 . 0 AC. 6" NEEDS SEEDING 30 . 0 AC GRADING SEEDBED 30 . 0 AC RESOIL @ 3 " 12 , 100 CY ROOT ZONE @ 6" 24 , 200 CY CUT/FILL (zone 1) 1, 310 CY Rock face backfill (zone 2) 61, 960 CY BACKFILL SLOPING (zone 3) 5, 250 CY SECONDARY REVEGETATION 250