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Highlights
- Resolution Minerals has reported tungsten concentrates grading 52.3% WO3 from Golden Gate stockpile material.
- Preliminary gravity test work achieved a 19-fold upgrade relative to composite sample grades.
- Heavy liquid separation tests have returned up to 75.5% recovery in scoping work.
- Additional concentrate testing is progressing on tungsten, antimony and gold samples.
- The company is preparing a Phase 2 drilling program for May 2026 targeting a maiden mineral resource estimate.
Resolution Minerals Ltd (ASX:RML) (OTCQB:RLMLF) has reported preliminary metallurgical results that have drawn attention to the potential value contained in historical stockpiles at its Golden Gate Tungsten mine within the Horse Heaven Project in Idaho. The results, centred on tungsten concentrates grading 52.3% tungsten oxide (WO3) and a 19-times upgrade from composite sample grades, add a processing angle to the broader Horse Heaven antimony-tungsten-gold strategy while further testing continues.
Historic Stockpiles in Focus
The update follows gravity separation test work on tungsten-bearing stockpiles at the Johnson Creek mill site, sourced from historical mining at Golden Gate. Composite samples grading 1.85 wt% WO3, predominantly as scheelite, were subjected to heavy liquid separation, producing concentrates grading 52.3 wt% WO3.
The results also returned recovery of up to 75.5%, with the upgrade ratio indicating the stockpiled ore may be amenable to simple gravity-based processing methods. The work is preliminary, though it has opened a pathway for assessing short-term processing options tied to historical material already on site.
Reflecting on the results, Dr. Adam Roper, Resolution’s In-house Senior Metallurgist, stated: “The initial results are encouraging for the short-term processing of the historical tungsten stockpiles via simple gravity methods. This is a great start and I’m looking forward to discussing the final results in the coming weeks, while discussions are underway with smelters and refiners.”
Gravity Processing Advances
Heavy liquid separation testing used density differences between scheelite and surrounding material to concentrate tungsten. According to the company, these scoping tests form an early step in evaluating the suitability of gravity methods for stockpile material.
Further metallurgical work is underway, including preparation of a larger 50kg sample for shaker table concentration, with final product results expected in coming weeks. Test work is also advancing on concentration options for antimony ore and gold at IMO labs in Perth.
Broader Strategy Progresses
The company is advancing processing studies alongside discussions with tungsten smelting and refining groups, linking metallurgical work to broader development planning. The stockpile processing assessment also forms part of Resolution’s wider Horse Heaven strategy, which includes recently acquired infrastructure.
Looking ahead, attention is shifting toward a Phase 2 drilling campaign scheduled to begin in May 2026. The program is planned for up to 45,000 feet of diamond drilling. It is designed to help define the scale of gold and tungsten mineralisation at Golden Gate and Golden Gate South and support progression toward a maiden Mineral Resource Estimate.
Shares of RML were trading at AUD 0.074, up over 5%, at the time of writing on 28 April 2026.
