2020-08-09_PERMIT FILE - M2020041

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Peak Ranch Resource August 5, 2020 however, when necessary,topsoil may be stored in a temporary stockpile area shown on Exhibit C, Sheet C- 2A. 2.2 Phase 2 Reclamation Plan Phase 2 involves wet mining the Phase 2 footprint(see Exhibit C, Sheet C-26). Therefore, there will be no need for further contemporaneous reclamation during Phase 2 as the excavating in this phase will occur below the water table.All side-slopes leading down to the expected lake elevation will have been fully reclaimed during Phase 1. The Phase 2 area is not being dewatered and is instead being wet mined because the final end-use for the area is a 26-acre groundwater lake. 2.3 Topsoil and Overburden Handling It is not anticipated that any topsoil will need to be imported for the reclamation process, even at the point of greatest disturbance. The scenario of peak simultaneous disturbance requiring reclamation occurs at the end of mining Phase 1 South when the side slopes around Phase 1 South are reclaimed and the 26-acre footprint for Phase 2 is disturbed prior to beginning the mining of Phase 2. Reclamation will only be necessary in this area if Phase 2 mining is not pursued. Exhibit F, Sheet F-2 shows this 26-acre area and its possible reclamation requirements. If Phase 2 is not mined and it needs to be reclaimed,the topsoil that will have been used to create screening berms on the north and west sides of the site will provide enough topsoil to reclaim the Phase 2 area. Overburden and topsoil stripped during mining will either be used to construct screening berms, stored in the temporary stockpile area in Phase 1 or will be directly placed as part of contemporaneous reclamation. Topsoil and overburden that is stockpiled will be kept in separate piles in the temporary stockpile area.All the overburden and topsoil will be used on the site for reclamation. Tables E-2 a and b, below, outline the topsoil and overburden material balance calculations during reclamation and during the greatest disturbance area scenario. Any topsoil remaining in the topsoil stockpile at the end of Phase 2 mining will be used for reclamation. Excess overburden or topsoil generated during mining will be placed in reclaimed areas. Overburden will not be stripped from berm or road areas. To calculate the topsoil stripping and replacement volumes in the table below, a maximum topsoil depth of six inches was assumed. Table E-2a: Topsoil and Overburden Material Balances During Reclamation per Reclamation Plan F-1 (Phase 1 and Phase 2 mining complete) Material by Material Used in Material Required for Material Used for Mining(Cy)3 South Berm(Cy)4 Reclamation(Cy)5 Reclamation(Cy)6 Topsoil 43,560 1,540 21,780 42,020 Overburden 87,120 13,159 0 73,961 Table E-2b: Topsoil and Overburden Material Balances During Reclamation per Reclamation Plan F-2 (Phase 1 mining complete, Phase 2 mining not executed) Material Generated by Material Used in Material Required for Material Used for Mining(Cy)3 South Berm(Cy)4 Reclamation(CY)s Reclamation(Cy)6 Topsoil 43,560 1,540 41,213 42,020 Overburden 87,120 13,159 0 73,961 3 Amount of topsoil and overburden stripped during mining based on soil survey assumed thicknesses. Amount of topsoil and overburden to be used to construct the permanent berm on the south side of the site. 5"Material Required for Reclamation"is the amount of material necessary to ensure the areas that need to be reclaimed will have about 6 inches of topsoil. s"Material Used for Reclamation"reflects the amount of material that will be placed during reclamation in order to use all the excess material on site. It should be noted that even in the case of Phase 2 not being executed,there is more topsoil that will be used for reclamation compared to what is required because of the topsoil that was stripped to construct the permanent access road. Gnu l,cwio6i aad hssxialrs,1'LL( E-2 O TETRA TECH