Trigg Minerals Partners with Metso to Develop Low-Impact Antimony Processing Solution

Trigg Minerals has engaged global processing and refining leader Metso to design a scalable and environmentally responsible processing pathway for antimony sulphide concentrates from its Antimony Canyon Project (ACP) in Utah. The collaboration centres on Metso’s Ausmelt Top Submerged Lance (TSL) smelting technology, known for its high metal recovery, energy efficiency, and low emissions.

Metso will deliver a Front-End Loading Level 1 (FEL1) study that investigates a three-stage pyrometallurgical flowsheet: primary smelting to produce antimony oxide fume, treatment to produce crude metal, and final refining to reach a target purity of 99.65%. The study will assess an initial throughput capacity of 3,000 to 5,000 tonnes of refined antimony metal per annum.

Ausmelt TSL, already widely used in copper, lead, and zinc processing, has demonstrated strong pilot-scale results for antimony. The technology’s low carbon footprint, due to its high thermal efficiency and compatibility with renewable energy, hydrogen, and biochar, supports Trigg’s broader decarbonisation strategy. It also enables waste heat recovery to offset plant energy demand.

This partnership is a key part of Trigg’s plan to establish a secure, western-aligned supply chain for antimony—recognised as a critical mineral for national security and energy applications. According to Managing Director Andre Booyzen, the use of proven and environmentally sound technology strengthens the company’s strategy to deliver high-purity antimony from a Tier-1 jurisdiction. Further updates will follow the completion of the FEL1 study.