United States Antimony Corporation (UAMY) has accelerated mining operations at its Stibnite Hill property in Montana, resuming activity in April after a winter shutdown that concluded the 2025 campaign in November. The company has transported 42 loads of stibnite ore in 2026, averaging approximately 14 tons per truck with an antimony content of around 10%, totaling roughly 576 tons to date.
Current operations are running at roughly three loads per day, equating to about 42 tons of ore daily. This pace more than doubles the daily rate achieved during the 2025 campaign, when approximately 800 tons were transported over a 45-day period. The extracted material is transported from Stibnite Hill to the company’s flotation mill in Radersburg, Montana, for processing into antimony concentrate.
The concentrate is then shipped to either the company’s smelter in Thompson Falls, Montana, or the Madero smelter in Mexico for conversion into finished antimony products. United States Antimony describes itself as the only fully integrated antimony producer outside China and Russia, with operations spanning mining, processing, and smelting. The company also produces zeolite and other minerals alongside antimony.
