2020-06-29_PERMIT FILE - M2020007 (3)

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Environment, Inc. Page 3 Adequacy Response#3 June 26, 2020 M-2020-007 Thank you for the suggestions they will incorporated when the notices are prepared and testing begins. EXHIBIT L - Reclamation Costs (Rule 6.4.12): All information necessary to calculate the costs or reclamation must be submitted and broken down into the various major phases of reclamation. You must provide sufficient information to calculate the cost of reclamation that would be incurred by the state. Based on the information provided for the phased mining DRMS suggests the following breakdown for calculation of the required bond at this time: Phases 1 a/2a—Cost to: • backfill each phase excavation to original grade after mining at 3:1 slope; • replace 10" topsoil; • prepare disturbed areas for crop planting the following season or revegetate with provided seed mix. Phases 1 and 2 —Cost for: • 100% installation cost for slurry walls if groundwater will be exposed prior to obtaining provisional approval of slurry wall from SEO - Slurry wall bonding may be reduced to 20% of total cost when provisional approval by SEO is obtained prior to exposing groundwater; • final grading for pit slopes which have been mined at a 3:1 slope; • replace 10" of topsoil around perimeter above high water line; • revegetate perimeter areas using provided seed mix; • Costs for design and installation of appropriate pit wall and lateral berm protection will need to be included if utilized and in order to bond slurry wall at 20% rate. (see Exhibit E comments). Phase 3 — Cost for: • removal and disposal of all concrete pads/footers for plant, scale, office, conveyor, etc.; • removal of all buildings and other site facilities; • backfill settling pond • rip/regrade all affected area; • replace 10" topsoil over affected area and prepare for crop planting the following season or revegetate with provided seed mix; Six tables have been prepared showing the direct costs for Phase 1, 1A, 2, 2A, 3. The floating costs tables has the working areas associated with the mine face, stripped areas, weed control and sequential armoring. The Phase tables show the total cost to reclaim each Phase but the numbers that are