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Closure Cost Estimate <br />Underground Openings <br />Project Name: Cross and Caribou Reclamation Estimator - Reclamation Plan <br />Date of Submittal: November 23 2021 <br />File Name: RND2_Cross And Caribou Reclamation Cost Estimator_REVB.xlsm <br />Model Version: Version 1.4.1 <br />Cost Data: User Data <br />Cost Data File: SRCE_Cost_Data_File_1_12_Std_2020.xlsm <br />Cost Estimate Type: Surety Cost Basis: Northern Nevada <br />Underground Openings Cost Summary <br />Labor Equipment Materials Totals <br />Adits, Portals & Declines Plugging $4,438 $342 $12,711 $17,491 <br />Shaft Backfill/Cover $1,554 $3,298 N/A $4,852 <br />Shaft Capping $1,072 $82 $556 $1,710 <br />TOTALS $7,064 $3,722 $13,267 $24,053 <br />Underground Openings - Calculations <br />Adits, Declines and Portals - Volume Calculations <br />Concrete Cover/Bulkhead Volume Calculation <br />Using Means Heavy Construction Cost Data (2004) <br />Estimage cover/bulkhead thickness <br />Assumes that all concrete works are reinforced <br />Productivity for crew from Means Heavy Construction Cost Data (2004) adjusted for supervision <br />(addressed in Misc. Costs) and Davis-Bacon Wage Rates <br />Assumes 18 in thick slab <br />Backfill Calculations <br />Uses 1 large and 1 small dozer for adit backfill <br /> Assumes max 400 foot push <br /> Assumes average operator and 50 min/hr availability <br />Uses truck & loader load, haul place fleets for shafts <br />Concrete cap will be 1.5 feet thick, reinforced, structually supported. <br />If concrete cap is used, assume 10 feet of rock backfill on top of cap. <br />Assumes that all concrete works are reinforced <br />If backfill is used, assume overfill by 5 feet <br />Carpenter rate incl Fringe: 0 per hour <br />Shaft Volume Calculations <br />11/21/2021 <br />Copyright © 2004 - 2009 <br />SRCE Software. All Rights Reserved. Page 3 of 5 Underground Openings <br />H = Shaft <br />Depth <br />Thickness <br />of B ulkhead (8) C ross-Sect ional Area (A) = W ~ H <br />Volume of Concrete Bulkhead = A x B <br />V olume o f Backfill = A X D <br />d = D iameter <br />Rad ius (r) = ½d <br />Cross-Section al Area (A ) = rrr2 <br />V olume = A x H