 Perpetuas Antimony Will Power Ambris Low-Cost Battery for Long-Duration, Daily Cycling Energy Storage Committed Amount Sufficient to Generate Over 13 Gigawatt Hours of Storage, Equivalent to Over 8x the Size of the Entire US Energy Storage Market in 2020 Solidifies Perpetuas Standing as a Leading ESG-Focused Mining Company Enabling the Green Energy Transition Restoring the Environment BOISE, ID, Aug. 9, 2021 PRNewswire - Perpetua Resources Corp. Nasdaq: PPTA TSX: PPTA Perpetua Resources or the Company has entered into an agreement the Agreement to supply a portion of antimony production from the Stibnite Gold Project to Ambri Inc. Ambri, establishing the foundation to help facilitate the decarbonization of energy grids in the U.S. and around the world. Perpetuas Stibnite Gold Project, located in central Idaho, will provide Ambri with antimony from the only responsible and domestically mined source of the critical mineral in the U.S. Ambri, a U.S. company, has developed an antimony-based, low-cost liquid metal battery for the stationary, long-duration, daily cycling energy storage market. 