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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.xism <br /> Cost Estimate Type:Surety Cost Basis:N.Nevada Notice Level <br /> Exploration-Cost Summary <br /> Labor Equipment Materials Tota s <br /> Hole Abandonment Costs $711 $520 $1 $1,238 <br /> Trench Backfilling Costs $0 $0 $0 <br /> Subtotal Earthworks $711 $520 $7 $1,238 <br /> Trench Reve etation Costs $0 $0 $0 so <br /> TOTALS $711 $520 $7 $1,238 <br /> Exploration Trenches-Calculations <br /> Exploration Trench Volume Calculation Dozing&Ripping/Scarifying Calculations <br /> Dozing:Dozing distance=1/2 trench length or 400 ft(max push)whichever is less <br /> Assumes flat push(grade correction factor=1) <br /> b - <br /> T Revegetation: 10 itadded to trench width to account for revegetation under spoil pile <br /> Sidewall angle T <br /> d <br /> Trench Volume=Trench Length x Cross Section>Area 1 <br /> 31212023 <br /> Page 7 of 56 Exploration <br />