2022-02-09_PERMIT FILE - M2021046 ‎(5)‎

• Permit No: M2021046
• IBM Index Class Name: Permit File
• Doc Date: 2/9/2022
• Doc Name Note: Appendix B Gem Services Report
• Doc Name: Adequacy Review Response
• From: Zephyr Gold USA Ltd
• To: DRMS
• Email Name: TC1
• Email Name: MAC
• Media Type: D
• Archive: No

GEM seRv cES
Dawson Project—Tailings Characterization Page i
Table of Contents
1 Introduction.............................................................................................................. 1
1.1 Project Description..........................................................................................................1
1.2 Filtered Tailings Storage Facility..................................................................................... 1
1.3 Scope of Work................................................................................................................2
2 Laboratory Program ................................................................................................ 2
2.1 Approach ........................................................................................................................2
2.2 Samples..........................................................................................................................3
3 Geochemical Characterization................................................................................4
3.1 Static Tests.....................................................................................................................4
3.1.1 Mineralogy...........................................................................................................................4
3.1.2 Acid Generation Potential....................................................................................................7
3.1.3 Solid Phase Elemental Content......................................................................................... 10
3.1.4 Short Term Metal Release Potential................................................................................. 14
3.2 Kinetic Tests ................................................................................................................. 17
4 FTSF Seepage Quality 21
4.1 Operational Period.....................................................................................................
4.2 Post-Closure Period......................................................................................................23
5 Summary ................................................................................................................ 26
6 Signature ................................................................................................................ 27
7 References ............................................................................................................. 27
DDSIdds Zephn Dawson Tailings Characterization Final Report,Feb.3,22,1:18 PM Feb 2022