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Investor Presentaiton

Rosh Pinah Mine - Namibia 2.5 billion lbs contained zinc (in measured & indicated resources - as at June 30, 2020) 2020 Production (100% basis) Zn 86 million payable lbs Zinc Pb 18 million payable lbs Lead Ag 225,000 payable ozs Silver Highlights RP2.0 Expansion Project PFS delivered in August 2020; FS expected in H2 2021 Gergarub Joint Venture • Near mine exploration targets TREVALI ROSH PINAH NAMIBIA Reserves and Resources (as at June 30, 2020) Category Tonnes Zn (%) Pb (%) Ag (g/t) Proven Reserves 4.24 7.32 1.99 23.7 Probable Reserves 6.99 5.62 0.93 16.2 Proven and Probable Reserves 11.23 6.26 1.33 19.0 Measured Resources 8.13 7.38 2.11 25.7 Indicated Resources 7.97 7.08 1.22 19.8 Measured and Indicated Resources Inferred Resources 16.10 7.23 1.67 22.8 3.43 6.71 1.34 23.2 See "Compliance with NI 43-101" for additional information on the mineral reserves and mineral resources in above table. Proven & Probable Reserves included in Measured & Indicated Resources. Mineral resources that are not mineral reserves do not have demonstrated economic viability. 18
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