2022-02-09_PERMIT FILE - M2021046 ‎(4)‎

• Permit No: M2021046
• IBM Index Class Name: Permit File
• Doc Date: 2/9/2022
• Doc Name Note: Appendix E AMEC 2016 Sub App F CQA
• Doc Name: Adequacy Review Response
• From: Zephyr Gold USA Ltd
• To: DRMS
• Email Name: TC1
• Email Name: MAC
• Media Type: D
• Archive: No

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Zephyr Gold USA Ltd. PAGE 2 OF 15
Dawson Gold Project SEC. NO.:
Dawson Filtered Tailings Storage Facility SPECIFICATION 02200.0
Pre-feasibility Study
TECHNICAL SPECIFICATIONS FOR DATE: (ORIGINAL)
Fremont County, Colorado EARTHWORKS 20-October-16
PROJECT NO.: 74201633 REVISION: A
DATE: 20-Oct-16
TABLE OF CONTENTS
1.0 GENERAL...............................................................................................................................................3
1.1 SUMMARY.................................................................................................................................3
1.2 APPLICABLE STANDARDS......................................................................................................3
1.3 DEFINITIONS ............................................................................................................................4
2.0 CONSTRUCTION QUALITY ASSURANCE: ..........................................................................................5
3.0 MATERIALS............................................................................................................................................5
3.1 FILTERED TAILINGS ................................................................................................................5
3.2 ROCKFILL..................................................................................................................................6
3.3 STRUCTURAL FILL...................................................................................................................6
3.4 GEOMEMBRANE CUSHION MATERIAL..................................................................................7
3.5 UNDERDRAIN MATERIAL........................................................................................................7
3.6 EROSION PROTECTION LAYER.............................................................................................8
3.7 RIPRAP......................................................................................................................................8
4.0 EXECUTION ...........................................................................................................................................9
4.1 CLEARING AND GRUBBING....................................................................................................9
4.2 TOPSOIL REMOVAL.................................................................................................................9
4.3 SUBGRADE PREPARATION AND FOUNDATION ACCEPTANCE.......................................10
4.4 CQA TESTING......................................................................................................................... 10
4.5 FILL PLACEMENT AND COMPACTION.................................................................................10
4.5.1 GENERAL GUIDELINES......................................................................................... 10
4.5.2 FILTERED TAILINGS .............................................................................................. 11
4.5.3 ROCKFILL................................................................................................................ 12
4.5.4 STRUCTURAL FILL................................................................................................. 12
4.5.5 GEOMEMBRANE CUSHION MATERIAL ...............................................................13
4.5.6 UNDERDRAIN MATERIAL...................................................................................... 13
4.5.7 EROSION PROTECTION LAYER........................................................................... 14
4.5.8 RIPRAP.................................................................................................................... 14
S:\ZEPHYR MINERALS\DRMS MINE APPLICATION\02200-EARTHWORKS.DOCX