September 22, 2025
U.S. Army opens future domestic source of antimony sulfide
By Daniel Flynn
U.S. Army – The U.S. Army’s Joint Program Executive Office Armaments and Ammunition (JPEO A&A) joined Perpetua Resources Inc. to kick off the Stibnite Gold Project in central Idaho. The project seeks to redevelop an abandoned mine site in Stibnite for gold and other materials. One of the key materials resulting from the gold mining operation is antimony sulfide, a critical component used in ammunition production. The U.S. previously obtained antimony sulfide from foreign sources until 2021 when that supply ended.
The kickoff event recognized key permitting milestones and the start of planning for construction activities and was hosted by Jon Cherry, president and chief executive officer of Perpetua. Maj. Gen. John T. Reim, Joint Program Executive Officer Armaments & Ammunition and Picatinny Arsenal Commanding General, joined Idaho Governor Brad Little and Deputy Under Secretary of Agriculture for Natural Resources and Environment Kristin Sleeper, as well as other key project stakeholders at the event.
