DoD Invests in US Antimony Facility to Secure Critical Mineral Supply Chain

The United States Antimony Corporation (USAC) has officially launched a new antimony processing facility near Radersburg in Broadwater County, Montana, backed by substantial investments and contracts from the Department of Defense (DoD). This strategic development allows for the complete domestic production of antimony, a critical mineral that plays a significant role in various industrial and military applications. The move is in line with the DoD's initiatives to enhance U.S. supply chain resilience and bolster national security by reducing dependency on foreign sources for essential minerals.

Antimony is increasingly recognized for its applications in sectors ranging from electronics to defense. As a valuable component in manufacturing alloys, fire retardants, and components in solar panels, antimony is used extensively within the defense sector, particularly in munitions and battery technology. Historically, the U.S. has relied heavily on countries like China and Russia for antimony; however, the U.S. government is now prioritizing the establishment of domestic sources through contracts and funding.

In 2025, the DoD awarded USAC a $245 million contract to supply antimony for the national defense stockpile, highlighting the agency's commitment to securing these critical mineral supply chains. Further emphasizing this commitment, the DoD announced an investment of $27 million in March 2026 to assist in modernizing USAC’s facilities, ensuring they are equipped to handle the increased production capacity required to meet national needs.

Montana Governor Greg Gianforte underscored the significance of this initiative, asserting that it represents a concerted effort to re-shore vital supply chains and further states' strategic economic interests. He noted, "We have the critical minerals that are necessary to provide for additional national security for our country, and this investment by U.S. Antimony is a good first step in re-shoring these supply chains."

State leaders, including Gianforte, have positioned this development within a broader context of enhancing domestic production capabilities. The Radersburg facility is expected not only to meet government contracts but also to be in the vanguard of a push to develop an entire supply chain for antimony in the region. USAC has indicated that it anticipates sourcing material from its Stibnite Hill mine near Thompson Falls, with additional materials expected from prospective mining operations in Alaska. The processing facility will concentrate the antimony mineral, ultimately producing nearly pure ingots at the company's smelter in Thompson Falls.

This facility marks a pivotal moment, as it represents the only operational site besides a few global players like Russia and China that can manage the comprehensive production of antimony. USAC's CEO, Gary C. Evans, remarked on the unique position Montana holds in the antimony production landscape, stating, "That makes this state very unique." This facility not only bolsters mineral production in the state but also opens potential subcontracting opportunities for other companies involved in the supply chain and logistics needed to support this operation.

Experts in the defense procurement sector should closely monitor developments like USAC’s new facility as they have significant implications for future contracts and partnerships, emphasizing the growing trend towards domestic sourcing for critical materials. The Radersburg operation's success could serve as a model for similar initiatives focused on domestic supply chains, potentially leading to increased demand for contractor participation in defense-related material production.

In summary, USAC’s capacity expansion in Montana not only fulfills immediate defense supply needs but also positions the U.S. more securely in the context of global mineral supply chains. With rising national security concerns, procurement professionals and stakeholders in the defense industry should analyze and adapt to this evolving landscape for potential opportunities in collaboration, supply chain development, and funding support for future projects.

• The new antimony facility is the first of its kind in the U.S. capable of complete processing.
• The DoD is investing over $245 million to ensure the U.S. can secure antimony domestically.
• USAC’s investments could lead to further contracts within the critical minerals space.
• Montana aims to become a key player in the national minerals supply chain through this initiative.
• The facility includes a laboratory for furthering research and development in mining processes.