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Closure Cost Estimate <br /> Exploration <br /> Project Name: REX Exploration Montrose County Colorado-Notice or Exploration <br /> Date of Submittal: December 2022 <br /> File Name: REX_NOI_SRCE_Ver_1_4_1_017_NVb.xlsm <br /> Model Version:Version 1.4.1 <br /> Cost Data:User Data <br /> Cost Data File:20220801_SRCE_Cost_Data_File_1_12_Std_2022.xlsm <br /> Cost Estimate Type:Surety Cost Basis:N.Nevada Notice Level <br /> Exploration-Cost Summary <br /> Labor I EquipmenT—F-Materials I Totals <br /> Hole Abandonment Costs $711 $520 $7 $1,238 <br /> Trench Backfilling Costs $0 $0 $0 <br /> Subtotal Earthworks 711 520 $7 1,238 <br /> Trench Revegetation Costs 0 0 0 0 <br /> TOTALS $711 520 $7 $1,238 <br /> Exploration Drillhole Abandonment-User Input <br /> Facility Description Hole Plugging <br /> Total Max Holes rage Hole <br /> Description Number open at One Casing to Depth of Plug <br /> (required) ID Code Hole Type Diameter of Holes Time Remove Holeltt Depth to water Method <br /> (select) fl 0 bgs ft bgs (select) <br /> 1 Drill holes 7,8,11 Reverse Circ 6.0 3.0 1.0 400.0 400.0 400.0 Grout+Backfill <br /> Notes: <br /> 1.If core holes are pre-drilled,use length of hole below pre-drilled length <br /> 2.If Top Plug is selected,assumes maximum 1/2hr laborer time to place plug and backfill with cuttings/soil(including move-to/set up time). <br /> Drill holes range from 90 to 400 feet deep with an average of 166 feet. <br /> Exploration Trenches-User Input <br /> Facility Description Trench Parameters Backfill Revegetation <br /> Trench TrancM Adtlitional Cul <br /> Description Trench Trench Bottom Sidesteps Hrs Backflll Material Backfilling <br /> (required) ID Code Len gth Depth Width Angle for Walk-in Its Material Type Fleet Seed Mix Mulch Fertilizer <br /> ft ft 0 degrees hr (select) (select) (select (seleep sell fsalndl <br /> Notes: <br /> 1.Include one-wav hours necessary to walk equipment in from drop-off point to work area <br /> 2.Material Types are used for density correction based on material densities in Caterpillar Performance Handbook material density table <br /> Exploration Drillhole Abandonment <br /> Tot I sing Casing <br /> Hole Total Total Total Drillhole Removal Removal Plugging PluggingTop Seal <br /> Description Vol/foot of Plugging Grout Cuttings Top Seal Abandon. Labor E Equipment <br /> Plugging Material Total <br /> Equipment Labor Equipment Material <br /> (required) depth Material ttl Volume tz) Volume Volume 1", Hours Is'il Cost[sl Cost Cost Cost Cost Cost 1, Cost(5'11 <br /> tt3 cy cy cy hrs $ $ $ $ $ $ $ <br /> 1 Drill holes 7,8,11 0.200 Cuttings 0.00 2.44 0.19 5 344 $368 367 152 0 $7 1,238 <br /> 2.44 0.19 5 344 $368 367 152 0 7 1,238 <br /> Notes: <br /> 1.Assumes grout backfill from bottom of hole to 50'(15.24m)above static water level,up to 10'(3m)from top of hole <br /> 2.Assumes 25%loss to formation for grout backfill <br /> 3.If"Top Plug"hole plug method is used,assumes physical plug installed without backfill,grout or cement.Not available option for Nevada projects <br /> 4.Assumes top 20'(6 m)of hole is plugged with cement if"Grout Only","Backfill+Grout",or"Cement Plug"hole plug method are chosen. <br /> 5.Assumes that a)casing is not cemented entire length,b)does not include temporary surface casing <br /> 6.Assumes minimum 1 hr per hole for abandonment(excluding move-to and casing removal) <br /> 7,Assumes fixed hours per hole for setup&tear-down and moving between holes(see Productivty Sheet)per drill hole(includes rig time if grouting required,labor crew only if cuttings backfill only) <br /> 3212023 <br /> Page 6 of 56 Exploration <br />