Stibnite gold-antimony project in central Idaho. (Image: Amanda Stutt.) Perpetua Resources (Nasdaq, TSX: PPTA) partnered with the Idaho National Laboratory (INL) to host, commission and operate a flexible, modular pilot processing plant expected to be capable of recovering critical and defense-related minerals.The initiative — part of the Battelle Energy Alliance — is intended to demonstrate the feasibility of producing high-quality, military specification antimony trisulfide using material from Perpetua’s ...