Perpetua Resources, US Army, and Idaho National Laboratory Launch Critical Minerals Pilot Plant to Advance Antimony Trisulfide Supply

Perpetua Resources, the U.S. Army, and Idaho National Laboratory (INL) held a ribbon-cutting ceremony on July 29, 2026, for a modular pilot processing plant located at INL in Idaho Falls. The facility is designed to process antimony samples from the Stibnite Gold Project, aiming to demonstrate the production of high-quality antimony trisulfide for military and industrial applications.

The initiative is supported by more than $87 million in federal funding secured since 2022, including recent awards under the Defense Production Act and the Defense Ordnance Technology Consortium (DOTC) program. Senior government, military, and company officials attended the event, highlighting the project's significance to national security.

Perpetua Resources Corp. (PPTA) marked a ceremonial milestone with the ribbon-cutting of its pilot plant, confirming the physical realization of a partnership first announced in December 2025. The collaboration with the Idaho National Laboratory (INL) has been funded through multiple Department of Energy Technology Commercialization (DOTC) awards dating back to May 2025. While the pilot plant itself was previously disclosed, the event signifies that the modular facility is now in place.

The update did not provide new technical results, financing terms, or production targets, nor did it alter the project’s timeline, capital structure, or economics. Within the context of the project’s historical progression—where final federal permits were secured in 2025, early-works construction began in October 2025, and a $2.9 billion EXIM loan was approved in May 2026—the announcement is considered incremental and expected. Although the news demonstrates execution and continued government backing, it adds no genuinely new, market-moving information beyond what was already known.

Perpetua Resources Corp. (PPTA) is developing the Stibnite Gold Project in central Idaho, an open-pit mine designed to produce gold and antimony from a historically disturbed district. The project hosts 4.8 million ounces of gold reserves and contains the only identified domestic reserve of antimony in the United States. Antimony is a critical defense mineral, and the project is designed to supply up to 35% of U.S. demand during its first six years of operation.

Early-works construction commenced in October 2025 after the company received the final federal Record of Decision and conditional Notice to Proceed. Full construction is targeted to begin following a final investment decision in H2 2026, aiming for first production in 2029. Key strategic investors include Agnico Eagle Mines and JPMorganChase, both of whom participated in a $255 million private placement in October 2025.