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RESOLUTION MINERALS (ASX:RML) INITIATES DISTRICT-SCALE STREAM-SEDIMENT SAMPLING PROGRAM AT HORSE HEAVEN; AIMS TO VALIDATE GEOLOGICAL NEXUS WITH NEIGHBOURING STIBNITE PROJECT

Jane Morgan Management

22 September 2025
Adelaide, SA / Horse Heaven, Idaho, USA

RESOLUTION INITIATES DISTRICT-SCALE STREAM-SEDIMENT SAMPLING PROGRAM AT HORSE HEAVEN; AIMS TO VALIDATE GEOLOGICAL NEXUS WITH NEIGHBOURING STIBNITE PROJECT

Resolution Minerals Ltd (ASX: RML; OTCQB: RLMLF) has commenced a systematic, district-scale stream-sediment sampling program at its 100%-owned Horse Heaven Antimony-Gold-Silver-Tungsten Project in Idaho, USA. The program is the first modern, district-scale geochemical campaign across Horse Heaven and is designed to rapidly advance geochemical coverage and prioritise drill targets across an under-explored area between Resolution’s Golden Gate and Antimony Ridge prospects and the adjoining Stibnite Gold Project.

Key highlights

  • Program to cover ~59 km² and ~44 km of stream length, with an estimated ~100 stream-sediment samples to be collected.

  • Sampling focuses on multiple catchments draining prospective structures outside the well-understood Golden Gate and Antimony Ridge target areas.

  • Results will prioritise anomalies for follow-up soil grids, ground geophysics and drill targeting.

  • The work seeks to test the Intrusion-Related Gold System (IRGS) model for Horse Heaven and confirm geological linkage (nexus) with the adjacent Stibnite project.

Resolution’s CEO of U.S. Operations, Craig Lindsay, said:

“In parallel to our ongoing drilling program at Golden Gate and the soils and rock chip sampling at Golden Gate, Vibika Creek and Antimony Ridge, Resolution is taking an aggressive approach to identifying drill targets across Horse Heaven through this comprehensive stream sediment sampling program. A similar program has been used successfully at the neighbouring Stibnite Gold Project, and we expect this work will lead to an even larger portfolio of high-value exploration targets.

I believe Horse Heaven has the scale to be a district play and is one of the most target-rich projects I have ever been associated with. It’s very exciting to have a project that comprises past production, historical resources and significant district-scale exploration potential with exposure to critical metals, including antimony, tungsten, silver and gold.”

Strategic context
Resolution’s Horse Heaven sits immediately adjacent to Perpetua Resources Corp’s Stibnite Gold Project. Perpetua’s project has been advanced with significant recent financing and US government engagement: Perpetua received an indicative/preliminary project letter and indicative term sheet from the U.S. Export-Import Bank for potential debt financing of up to US$2.0 billion in early September 2025. (Perpetua Resources | Corporate) Perpetua also closed an upsized financing package of approximately US$425 million in June 2025, which included a US$100 million investment from Paulson & Co. to advance Stibnite. (perpetuaresources.com) Perpetua’s documentation and investor materials identify the Stibnite project as hosting c.4.8 million ounces of gold in reserve. (perpetuaresources.com)

The strategic importance of restarting domestic antimony supply is also evident in U.S. government and industry analysis: the United States is heavily import-reliant for antimony (USGS net import-reliance data for antimony is around mid-80s percent in recent years), underlining the potential national-security and supply-chain relevance of projects in Idaho. (U.S. Geological Survey)

Next steps
Resolution’s immediate objective is to rapidly extend geochemical coverage across Horse Heaven to:

  • identify new high-priority gold-antimony-tungsten-silver targets;

  • establish exploration potential across the majority of the project area outside the well-understood target zones; and

  • generate targets for mapping, soil grids, ground geophysics and drill testing in subsequent phases.

 


About us:

Resolution Minerals (ASX: RML) is a resource company engaged in the acquisition, exploration and development of precious, battery and strategic metals such as gold, copper, cobalt, and uranium.


Contact details:

Media & investor contacts (Australia)
Jane Morgan, Investor Relations (Jane Morgan Management)
M: +61 405 555 618 | [email protected]