2014-06-20_REVISION - M1981207 (10)

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Blue Pit Exhibit L - Reclamation Costs 112 Permit Amendment The worst case reclamation scenario will occur when the maximum length of pit wall is exposed, which is 500 feet, while at the same time, mining has progressed past the Basin Ditch. The east Topsoil Stockpile is still in place and the excess fill in the eastern portion of Mining Area 1 has not yet been moved. Structures to be Removed The haul roads that will remain after reclamation are shown on Map F. These roads will be used by the landowner for access through the site as well as to the irrigated pasture on the bottom of the site. Additionally, access to the concrete plant operation will remain after final reclamation. All structures (except for the concrete plant) will be removed. These structures include the to be removed mine office on a concrete foundation, truck scale, fuel tank containment and all portable equipment in the pit and scale. The conveyors, crushers and screening plants will be portable only. Backfilling Backfilling will consist of 2 separate tasks: 1- The eastern portion of Mining Area i will require bacicfilling on the north, east and south slopes. This material will be obtained from the excess fill previously placed on the eastern portion of Mining Area 1. The volume required is based on bacicfilling approximately 3,300 feet of slope from approximately 2H:1V to 2.5H:1V over a distance of 3,300 feet. Based on the surface models of Map C -2A and Map F, this is a volume of 359,647 cubic yards. The material will be obtained by pushing down the existing fill slope with a Cat D -8 dozer and then a loader will load 25 ton trucks to haul the material an average distance of 375 feet to the toe of the slope where an additional D -8 dozer will push up the slope to complete the backfill. The cost of this work is expected to be $3.05 per cubic yard. 2- As described above, 500 feet of pit length in Mining area 2 will require bacicfilling from i.5H:iV to 3.oH:iV. The backfill for this task will be obtained from the most recent overburden cut. Western Slope Aggregates, Inc. commits to no more than 500 feet of this slope requiring backfill at any one time. The volume required to backfill this area is 137,867 cubic yards, based on a depth of 90 feet. The cost to place this material is based on moving all the material from the eastern portion of Mining Area 1. Since there is minimal distance for the trucks to move the material, the cost of this work is $2.25 per cubic yard. Some excess fill may remain in place in the eastern portion of Mining Area 1 as long as this fill has a slope of no steeper than 2.5:1V. Therefore the total backfill required is 497,514 cubic yards. Since this material will be pushed up from the pit bottom, the cost per cubic yard is $2.25. Also at this time, there will be the largest amount of pit floor, plant area, internal roads and in- slopes to reclaim to irrigated fields /rangeland. These areas are determined below. Blue Pit May 2014 L -1