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WP GEM SERVICES <br /> Dawson Project—Tailings Characterization Page 18 <br /> with a higher concentration at the beginning of the testing period and then decreased in response <br /> to sulfide oxidation. <br /> Most metal concentrations were below the detection limit. Detectable metals are shown in Figure <br /> 6. Of these,aluminium,manganese and selenium have groundwater quality standards. <br /> Aluminium and selenium display relatively stable release over the testing period after the initial <br /> flush. Manganese concentrations decreased modestly near the end of the testing period. These <br /> results suggest no concentration increases in the long term due to oxidative processes. <br /> DDSldds Zephyr Dawson_Tailings_Charactedzation Final Report,Feb.3,22,1:18 PM Feb 2022 <br />