 2.3 billion After-Tax NPV 8 at Base Case metal prices After-Tax IRR 19.5 at Base Case metal prices Cashflow over the first four years of 965 million per year at Base Case metal prices Base case development contemplates 25-year mine life Extended Two-Phase development contemplates a 47-year mine life Base Case metal prices: Cu: US3.35lb, Au: US1,600oz, Ag: US24oz, Mo: US12lb VANCOUVER, BC, June 22, 2021 PRNewswire - Western Copper and Gold Corporation Western or the Company TSX: WRN NYSE American: WRN is pleased to release the results of its Preliminary Economic Assessment the PEA, or Study on its wholly-owned Casino copper-gold-molybdenum deposit in the Yukon Casino or the Project. The Study considered the Project being constructed as an open pit mine, with a concentrator processing nominally 120,000 tonnes per day and a gold heap leach facility processing nominally 25,000 tonnes per day. 