The United States Antimony Corporation (USAC) has resumed mining operations at its site situated on the Stibnite Hill in Thompson Falls, Montana, US.
Mining operations ceased last November due to harsh winter weather.
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However, milder conditions and low snowfall this past winter allowed USAC to restart operations earlier than planned.
In a two-month period last year, USAC transported over 800t of antimony ore to the Radersburg Flotation Facility for processing.
The resulting concentrate is then sent to the Thompson Falls smelter to create finished products for customers.
This year, USAC is making several adjustments to its mining strategy.
After removing larger trees, a chipper will be used to process smaller brush into mulch, aiding in quicker revegetation as part of ongoing reclamation efforts.
Professional surveyors are establishing base stations on nearby mountains, where GPS technology will enhance the accuracy of mapping and recording antimony vein intercepts, helping to project veins’ strike and depth.
The collected data will also help delineate disturbed areas, setting parameters for reclamation activities.
Last month, USAC secured $27m in funding from the Department of War through Title III of the Defence Production Act, focusing on the extraction of critical domestic materials.
This funding aims to enhance and expand the extraction, processing, and refining processes for these essential materials.
The initiative is part of a wider effort by the US Government to boost the production of critical minerals, as detailed in Executive Order 14241, issued in March 2025.
In September 2025, USAC secured a contract worth up to $245m from the US Defense Logistics Agency (DLA) to supply antimony metal ingots for the national defence stockpile over the next five years.
