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Homestake Mining Company June 17,2019 <br /> Regular(112d)Operation Reclamation Permit Application Package <br /> Project Name: Pitch Mine Reclamation Project-Reclamation Plan <br /> Date of Submittal: March 1,2019 <br /> File Name: SRCE_Version_1 4_1_016c 2019-06-06 amh User 3 Updates.xlsm <br /> Model Version:Version 1.4.1 <br /> Cost Data:User Data <br /> Cost Data File:SRCE_Cost_data-USR_1_12_2019-06-14.xlsm <br /> Cost Estimate Type:Surety Cost Basis:Northern Nevada <br /> Exploration-Cost Summary <br /> Labor gmpmen a aria s o as <br /> Hale Abandonment Costs $0 $0 $0 $0 <br /> Trench Backfilling Costs $0 $0 $0 <br /> Subtotal Earthworks 0 0 $0 $0 <br /> Trench Reve elation Costs $0 s0 $0 $0 <br /> O ALS 0 $01 $0, 0 <br /> Exploration Drillhole Abandonment-User Input <br /> Facility Description Hole Plugging <br /> Total Max Holes Average Hole <br /> Descdptlon Number Open at One Casing to Depth of plug <br /> (required) ID Code Hole Type Diameter of Moles Tlme Remove Hole' Depth to Water Method <br /> (select) h hbgs hbgs (selectl <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(includng move-to/set up time). <br /> Exploration Trenches-User Input <br /> Facility Description Trench Parameters Backfill Revegetation <br /> Trench Trench Additional Cu'U c sc,ipuon Trench Trench Bottom Si—im,e Mrs Hac krill Material Backfilling <br /> ircqu�redl ID code Length Depth width Angle ror WMkan Material Type Fleet Seed Mix Mulch Fertilizer <br /> h R oeg-es ni sel�.h (select) iselect l (select l (selectl Isdectl <br /> Notes: <br /> 1.Include one-way 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 /> sm9 Casing <br /> Hole Total Total To <br /> 0"I"Inch, Removal Removal Plugging Plugging Plugging Top Seal <br /> Vd or Descripfi- /foot of Plugging Grout Cuttings Top Seal Abandon. Labor Equipment Lab Equipment Material Material Total <br /> (required) depth Material Volume'` Volume Volume ° Hours" Cost cost Cost Cost Cost Cost lt'n Cost" <br /> h3 cy cy cy his $ $ $ 8 $ $ $ <br /> 01 $01 so so so 151 0 <br /> Notes. <br /> 1.Assumes gout 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 10'(3 m)of hole is plugged with cement if"Grout Only","Backfill i 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 8 tear-dam and moving between holes(see Productivty Sheet)per drill hole(includes rig time if grouting required,tabor crew only if cuttings backfill only) <br /> Page 1 of 2 HOMESTAKE MINING COMPANY <br /> 38 of 164 <br />