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Owh GEM SERVICES <br /> Dawson Project—Tailings Characterization Page 2 <br /> Y°Y±3 a R ".... <br /> Source: Amec Foster Wheeler,2016 <br /> Figure 1: Schematic of Filtered Tailings Storage Facility <br /> While the FTSF will be crowned to shed as much precipitation as possible, some infiltration will <br /> occur. A seepage collection blanket will be installed underneath the FTSF to collect this <br /> infiltration water. This infiltration water will be captured in the lined contact water pond along <br /> with the contact water described above. <br /> 1.3 Scope of Work <br /> GEM Services' brief is to characterize the geochemistry of the Dawson Deposit tailings. Given <br /> the design of the FTSF,the development rock earmarked for the supporting buttress was also <br /> characterized. The objectives of the characterization program include: <br /> • Assessing the acid generation potential of the tailings and development rock <br /> • Assess the potential for metal release from tailings and development rock during operations <br /> • Assess the potential for long term metal release from tailings. <br /> 2 Laboratory Program <br /> The laboratory testing program was conducted by Global ARD Testing Services Inc., located in <br /> Burnaby, BC Canada. The program was overseen by GEM Services. <br /> 2.1 Approach <br /> As described in Section 1.2 above,the FTSF will contain two distinct materials—development <br /> rock from the construction of the decline and dewatered tailings. The tailings are further <br /> delineated into altered and unaltered,based on the ore type from which they are derived. Each of <br /> these materials (development rock, altered tailings and unaltered tailings)were characterized <br /> individually. <br /> DDS/dds Zephyr.Dawson Teilings Chametedzabon_Final Feb 2022 <br /> Report,Feb.3,22,1:18 PM <br />