Perpetua Resources Corp. (NASDAQ:PPTA) (TSX:PPTA) ("Perpetua Resources" or "Perpetua" or the "Company") today announced its wholly owned subsidiary Perpetua Resources Idaho, Inc. has entered into a Memorandum of Understanding ("MOU") to explore antimony processing opportunities with Sunshine Silver Mining & Refining Company ("Sunshine Silver" or "Sunshine"), also based in Idaho.

Testing under the MOU, which is non-binding and non-exclusive, will evaluate the technical potential for processing and refining antimony from the Stibnite Gold Project in Idaho at the Sunshine Mine Complex. The MOU will initiate third-party engineering to evaluate a flowsheet to suit different antimony ore types and follows engagement between the parties' technical and executive teams.