3D MODELLING OF HIGH-GRADE ANTIMONY-SILVER VEINS EXPOSED IN PAST MINING PITS DEMONSTRATE SIGNIFICANT SIZE & EXPANDING SCALE
HIGHLIGHTS
- 3D Modelling of numerous known Antimony and Silver bearing veins, veins swarms and stockworks, over a large area (1000m x 700m), reveals significant size and expanding scale potential at the Antimony Ridge Mine Project, within Resolution’s Horse Heaven Antimony-Tungsten-Gold-Silver Project.
- High Grades, Historical Mining: The Antimony-Silver-bearing veins, mined historically during World War I &II and the Korean War, have returned exceptionally high-grade Antimony (Sb) consistently above 30% up to 50% Sb and Silver (Ag) grades above 250 g/t Ag up to 1,420 g/t Ag (ASX announcement 15 September 2025).
- Numerous Vein Swarms: 3D modelling and ground mapping has identified more than 100 high-grade veins, modelled as 30 mineralised vein swarms, fault breccias and stockworks.
- Large Area: 3D modelling demonstrates that the mineralised vein swarms are arranged in en echelon clusters extending over a large area of approximately 1,000m x 700m (170 acres) and have a vertical range of 250m as indicated in outcrop elevations.
- Large Lower Grade Halo: Prior rock chip and soil sampling results show that the high-grade en echelon vein swarms occur within a broader zone of lower grade veinlets and stockworks with 0.5% to 2% Sb.
- Metallurgy Results Soon: Preliminary metallurgy test results are in process over a 100kg mini-bulk-sample collected of representative high-grade stibnite material.
- 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).
- Antimony Ridge forms part of Resolution’s broader Horse Heaven strategy, which includes recently acquired processing infrastructure, tungsten stockpiles and a major 2026 drilling program at Golden Gate starting in May.
Antimony Ridge hosts an Antimony-Silver vein and vein swarm system comprising high grade large veins, stacked “en echelon”, within a broader system of mineralised stockworks with a total strike length of 1,000m, open-ended in all directions. Such is the consistency of the vein frequency, and the vein swarms, that there is a high probability that future work will uncover more veins and extend the length and width of the vein system. The modelling has revealed significant size potential which demonstrates the strategic importance of Antimony Ridge as a potential source of U.S. domestic antimony supply.
WATCH:
RML’s CEO of US Operations, Craig Lindsay, gives an update on drilling preparations from the Horse Heaven Gold Antimony Tungsten Project.
