2022-09-26_PERMIT FILE - M2022042 (16)

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Windsor East Mine, Exhibit L—Reclamation Costs September 2022 RECLAMATION • During the life of mine, 150 acres will be disturbed by the mining activities and approximately 54.7 acres of that will be water surface once reclamation is completed leaving 95.6 acres to be topsoiled and seeded. This site will be mined and reclaimed concurrently to limit the number of times that overburden is handled. The spreadsheet below represents the estimated cost for the Division to reclaim the Windsor East Mine, based on the point in time in the mining schedule where reclamation cost will be the highest. This will occur when Cell A is lined, Cell C is mined out but not lined, Cell B has had the topsoil removed and Cell D is mined out. At this point there will be an estimated 117 acres of disturbance. COST PER #OF ITEM UNIT UNIT UNITS TOTAL COST Earthmoving and Revegetation Overburden Replacement Cubic Yard $1.75 489,000 $855,750.00 Topsoil Replacement Cubic Yard $1.75 68,600 $120,050.00 Disking or Scarifying Acre $28.50 96 $2,724.60 Grass Seed Mix Acre $40.00 96 $3,840.00 Drill Grass Seed Mix Acre $18.00 96 $1,728.00 Fertilizer Acre $30.00 96 $2,880.00 Fertilizer Application Acre $12.50 96 $1,200.00 Dewatering Lump Sum $10,000.00 1 $10,000.00 Liner Installation Cell C Mob, Bonding, and Ins Lump Sum $150,000.00 1 $150,000.00 Backfill 200-400' along river Cubic Yard $2.20 115,000 $253,000.00 Foundation Excavation Cubic Yard $3.50 18,000 $63,000.00 Slope Liner Embankment Cubic Yard $2.20 90,000 $198,000.00 Reservoir Bottom Grading Lump Sum $40,000.00 1 $40,000.00 TOTAL DIRECT RECLAMATION COSTS $1,702,172.60 Overhead& Profit Public Liability Insurance 0.0155 $26,383.68 Contractor Performance Bond 0.0155 $26,383.68 Contractor Profit 0.1000 $170,217.26 DRMS Project Administration Expense 0.0500 $85,108.63 TOTAL INDIRECT RECLAMATION COST $308,093.24 TOTAL PERFORMANCE BOND AMOUNT $2,010,266 OTETRA TECH P a g e