Successful testing progressing with conventional pyrometallurgy and hydrometallurgy processing options
HIGHLIGHTS
Antimony Trioxide Produced: Antimony trioxide product has been produced from large samples of stibnite from the Antimony Ridge historical open pits, using the conventional pyrometallurgical process of volatilisation, producing an intermediate product, with 99.38 wt% Antimony Trioxide (Sb2O3wt%) content.
Further Antimony Trioxide Refining Test Work: Further refining pyrometallurgical test work is underway and final product results will be released in the coming weeks.
Conventional Pyrometallurgy: Pyrometallurgy would be the base-case, conventional technology for processing antimony, with initial tests conducted by KPM in Ontario to produce antimony trioxide. A number of third parties have been approached regarding this processing option.
Mineral Processing Test Work Progressing: Test work is advancing on Antimony-bearing stibnite veins, that have returned exceptionally high-grade Antimony (Sb) consistently above 30% up to 50% Sb in recent results, mined historically during World War I &II and the Korean War, from Antimony Ridge, within Resolution’s Horse Heaven Antimony-Tungsten-Gold-Silver Project (“Horse Heaven”) (ASX announcement 15 September 2025).
Concentrate Test Work: Test work is advancing on options to concentrate the antimony ore, tungsten and gold at IMO labs in Perth, Australia.
Hydrometallurgy Progressing: Test work on Antimony Ridge samples using hydrometallurgical processing is underway at ANSTO in Australia and results will be released once available.
Current Lack of US Processing Options: Resolution’s goal is to develop a hydrometallurgy processing hub for antimony, as stibnite, in Idaho USA, due to the lack of modern processing options in the USA for antimony.
Numerous Vein Swarms: 3D modelling of numerous known antimony and silver bearing veins, veins swarms and stockworks, over a large area (1,000m x 700m) (170 acres), has revealed significant size and expanding scale potential at Antimony Ridge (ASX announcement 10 April 2026).
FAST-41: Horse Heaven was selected for the U.S. FAST-41 Transparency Coverage by the US-based Permitting Council, expected to accelerate permitting timelines with an application for 250 drill holes and large-scale bulk sampling (ASX announcement 8 April 2026).
The initial pyrometallurgical results from processing Antimony Ridge samples are very encouraging with few impurities. This is a great start and I’m looking forward to discussing the final results in the coming weeks. Resolution’s goal is to develop a processing hub in Idaho for stibnite and I’m relishing the opportunity to bring this to fruition, from mine to product.
The Johnson Creek Mill site, at the base of Antimony Ridge, is being considered as a fast-track option for potential development of a local processing site, given it has the necessary infrastructure on site, with power and water, and is on 10 acres of private land owned 100% by RML.
With the recent US Government Permitting Council provided via FAST-41 Coverage to accelerate permits, Resolution is in parallel developing further local processing plans to enable antimony and tungsten supply for US demand. Our unique combination of critical minerals assets makes us well placed to deliver.
WATCH:
RML’s CEO of US Operations, Craig Lindsay, gives an update on drilling preparations from the Horse Heaven Gold Antimony Tungsten Project.
