2019-06-28_REVISION - M1977004 ‎(12)‎

• Permit No: M1977004
• IBM Index Class Name: REVISION
• Doc Date: 6/28/2019
• Doc Name: Request For Amendment To Permit
• From: Homestake Mining
• To: DRMS
• Type & Sequence: AM1
• Email Name: DMC
• Email Name: THM
• Media Type: D
• Archive: No

Homestake Mining Company June 17,2019
Regular(112d)Operation Reclamation Permit Application Package
TABLE OF CONTENTS
TABLE OF CONTENTS .........................................................................................................i
LISTOF TABLES..................................................................................................................ii
LIST OF APPENDICES.........................................................................................................ii
1.0 INTRODUCTION..........................................................................................................1
2.0 PROJECT DESCRIPTION...........................................................................................2
3.0 RECLAMATION COST ESTIMATE.............................................................................3
3.1. Basis of Cost Estimation........................................................................................3
3.2. Reclamation Costs..................................................................................................3
3.3. SRCE Framework....................................................................................................4
4.0 RECLAMATION COST ESTIMATE.............................................................................6
4.1. General Assumptions.............................................................................................6
4.1.1. Units of Measurement...........................................................................................6
4.1.2. Exchange Rates....................................................................................................6
4.1.3. Take Off Procedures and Allowances...................................................................6
4.1.4. Factors..................................................................................................................6
4.1.5. Indirect Costs........................................................................................................6
4.1.6. Schedule...............................................................................................................6
4.1.7. Mobilization and Demobilization. ..........................................................................7
4.1.8. EPCM and CQA....................................................................................................7
4.2. North Pit...................................................................................................................7
4.2.1. East Diversion Ditch..............................................................................................7
4.2.2. Landslide Crest Mitigation.....................................................................................8
4.2.3. Northwest Pit Wall Layback..................................................................................9
4.2.4. Partial Pit Backfill ..................................................................................................9
4.2.5. French Drain System ..........................................................................................10
4.2.6. Southeast Pit Wall Buttress ................................................................................10
4.2.7. Cover Material Stockpiling ..................................................................................11
4.3. South Pit.................................................................................................................11
4.3.1. Landslide Slope Mitigation..................................................................................11
4.3.2. East Diversion Ditch............................................................................................11
4.3.3. Landslide Crest Mitigation...................................................................................12
4.3.4. Cover Material Stockpiling ..................................................................................13
4.4. Indian Rock Dump.................................................................................................13
4.4.1. Sericite Stockpile ................................................................................................13
4.4.2. Low Point Mitigation............................................................................................13
4.5. Tie Camp Rock Dump...........................................................................................14
4.5.1. Disposal and Repository Cell..............................................................................14
4.6. Water Management System..................................................................................14
4.6.1. Uranium Load Reduction ....................................................................................14
4.6.2. Well Abandonment..............................................................................................16
EXHIBIT L-RULE 6 4 12 (RECLAMATION COSTS)(Revised June 17,2019) Page i
HOMESTAKE MINING COMPANY