Felix Gold (ASX:FXG) has begun a hydrometallurgical pilot program, targeting first continuous antimony metal production from US domestic ore.
Around 300kg of massive stibnite from the Treasure Creek Project is in transition to Core Technologies. Initial testwork includes head characterisation, grind establishment, leach optimisation, liquid purification, and electrowinning trials.
The company says the program builds on prior testwork that achieved military-grade antimony concentrate and 98% extraction on first-pass results that no other western project has publicly shown.
Subject to initial testwork results, a continuous pilot campaign of one week is planned, producing antimony metal from the Treasure Creek Project’s ore and generating data to support Felix’s ongoing assessment of the economic viability of near-term antimony production.
Executive director Joseph Webb says no other project in the western market has validated military-grade antimony from domestic ore.
“No other project has proven processing pathways at this stage of development and no other project is this advanced in assessing the viability to deliver a fully integrated, military-grade, domestic US supply chain,” Webb says.
“Felix Gold has been solving problems across the entire supply chain, from ore to metal, executing every workstream required to reach a fully vertically integrated solution.
“This testwork program with Core Technologies is the next critical step: locking our process flowsheet and demonstrating first antimony metal production from Treasure Creek ore. It is the bridge from validated laboratory results to continuous commercial operations – and the foundation for restoring the entire supply chain of domestic antimony to the US.”
As Mining.com.au reported in 2025, antimony has gone from niche to indispensable in short order, following China’s export ban and rising critical minerals policy urgency in the US.
The US domestic supply is virtually non-existent, with smelting capacity also constrained globally. Presently, about 90% of global antimony production is controlled by China, Russia, and Tajikistan, which is creating significant supply risks for Western nations such as Australia, Canada, and the US.
In mid-November 2025, Felix delivered 89.2% antimony-bearing minerals in samples from the Treasure Creek Project, with flotation concentrates exceeding grades required for the US military.
The Treasure Creek Project, located in Alaska, hosts one of the only proven sources of antimony ore in the US.
Felix Gold says it is uniquely positioned with the combination of high-grade ore, proven processing pathway, active US Government engagement, and near-term execution capability.
Write to Aaliyah Rogan at Mining.com.au
Images: Felix Gold
