Pioneer Minerals Ltd – Springfield Historic Tailings Deliver 3.27% WO₃ Concentrate with 17.6x Tungsten Upgrade - Interesting
- Noel Ong
- 14 hours ago
- 9 min read
Updated: 5 hours ago
Announcement
Springfield tailings testwork deliver 17.6x tungsten upgrade – 10th March 2026 - view the announcement
The tungsten space is on top of my watchlist and this new development by Pioneer Minerals Limited is definitely worth a mention. As a shareholder and a keen advocate of the sector, I am interested to see what this new update will do for the market implication. The interest in the sector is rising so any form of news that may link the company to production of tungsten will be more than an interesting thought. At a current price of USD $1,700 mtu, it becomes easier for the business.
About Pioneer Minerals Limited
Pioneer Minerals Limited (ASX: PMM) is focused on the exploration and development of critical minerals projects in the United States, with its flagship North Pine Project located in Idaho (Figure 1). The project sits within the Yellow Pine mining district, an area known for tungsten and antimony mineralisation and located near major deposits including the Stibnite Gold Project.
Figure 1: Showing the Location of the North Pine Tungsten Project and prospect areas nearby to Perpetua Resources, Stibnite Gold Project and Resolution Minerals, Horse Heaven Antimony Project. (source: Pioneer Minerals Limited)
The Company is assessing the potential of historical tungsten mineralisation and historic mine tailings at the Springfield Tungsten Mine, which previously operated during the 1950s when tungsten was processed using gravity concentration techniques. Historical processing focused on recovering coarse tungsten grains, leaving finer mineral fractions in tailings.
Recent metallurgical test work has been undertaken on these historic tailings to evaluate whether modern mineral processing techniques can recover tungsten that was not captured by earlier processing circuits. This approach allows the Company to assess both potential value in historic tailings and metallurgical behaviour relevant to future exploration targets within the broader North Pine Project. Tungsten News
Introduction - Preliminary Metallurgical Test Work Demonstrates Significant Tungsten Upgrade Potential at Springfield
Pioneer Minerals Limited has reported results from preliminary metallurgical beneficiation test work conducted on historic tailings material from the Springfield Tungsten Mine, part of the Company’s North Pine Project in Idaho, USA. Tungsten News
The test work was undertaken by Mineral Technologies using composite material collected from historic mine tailings generated during previous tungsten production operations (Figure 2). These tailings consist primarily of fine-grained particles that were not recovered during historical gravity processing circuits, which typically operated at relatively coarse crush sizes.
Figure 2: A map of the historic Springfield Tungsten mine with location and grades of rock chip samples taken during reconnaissance field work (ASX: PMM 01/12/2025) and the location of tailing samples taken and composited used in the recovery test work underway with Mineral Technologies. (source: Pioneer Minerals Limited)
The metallurgical program aims to evaluate how fine-grained tungsten mineralisation behaves under modern beneficiation techniques, including particle size fractionation, heavy liquid separation and gravity concentration.
Initial results demonstrate that tungsten contained within the tailings can be materially upgraded using conventional gravity-based processing techniques, with the Mozley gravity table producing concentrates grading up to 3.27% WO₃, representing a 17.6 times upgrade relative to the initial tailings material.
These results provide early metallurgical insight into both the historic tailings and the potential behaviour of fine tungsten mineralisation within the Springfield system, supporting the broader evaluation of the North Pine Project.
Highlights - Metallurgical Test Work Demonstrates Significant Tungsten Upgrade Through Gravity Separation
The preliminary metallurgical test program delivered several key outcomes regarding the behaviour of tungsten mineralisation contained within the historic Springfield tailings (Figure 3).
Figure 3: Mineral Technologies and Pioneer scope of works and flowsheet showing work completed to date and results pending. (source: Pioneer Minerals Limited)
Strong Tungsten Grade Upgrade Demonstrated
Preliminary beneficiation test work showed tungsten grades could be upgraded by up to 17.6 times relative to the composite head grade through conventional mineral processing techniques.
High-Grade Tungsten Concentrate Produced
Gravity table testing using a Mozley table produced tungsten concentrates grading up to:
32,713 ppm WO₃ (~3.27% WO₃)
Concentrate generated from heavy mineral fractions following beneficiation
Figure 4: Shows phases of physical beneficiation from initial tailings head grade of 0.21% WO3 to 3.27% WO3 via HLS and Mozley Table. (source: Pioneer Minerals Limited)
This demonstrates that tungsten contained in the tailings can potentially be recovered using established gravity separation methods commonly used in tungsten operations. Tungsten News
Heavy Liquid Separation Confirms Dense Tungsten Mineral Phases
Heavy liquid separation (HLS) testing generated a dense mineral sink fraction grading approximately 9,060 ppm W (~1.14% WO₃).
This represents more than a five-times upgrade relative to the composite head grade, confirming the tungsten occurs in high-density mineral phases suitable for gravity-based recovery techniques.
Size-by-Assay Results Indicate Tungsten Enrichment in Fine Fractions
Particle size analysis showed tungsten grades increase progressively as particle size decreases.
Key results include:
Composite head grade: ~1,700 ppm W (~0.214% WO₃)
Peak grade in fine fractions: ~0.41% WO₃
This distribution reflects the historical processing approach where coarser tungsten minerals were preferentially recovered, leaving finer particles within the tailings material. Tungsten News
Metallurgical Test Program Supports North Pine Exploration Strategy
The metallurgical behaviour observed in tailings material provides insight into how fine-grained tungsten mineralisation from the Springfield system may respond to modern mineral processing methods.
These results will inform future exploration and metallurgical evaluation across the North Pine Project.
Management Commentary
Pioneer Minerals Chief Executive Officer Michael Beven stated that the preliminary metallurgical results provide an encouraging early indication of the response of tungsten mineralisation contained within the historic Springfield tailings to conventional beneficiation processes.
The size-by-assay results show that tungsten becomes progressively enriched within the finer particle size fractions, which is consistent with the expected behaviour of fine-grained tungsten mineralisation.
Heavy liquid separation testing also demonstrates that tungsten minerals within the sample exhibit a significant density contrast relative to surrounding gangue minerals, supporting the potential for gravity-based separation.
Gravity table testing further confirms that tungsten can be concentrated using conventional gravity processing methods, although recovery calculations will depend on completion of full mass balance analysis and optimisation of the metallurgical flowsheet. Tungsten News
Near-term Milestones to Watch
Pioneer Minerals has outlined several near-term activities associated with the North Pine Project and the ongoing metallurgical evaluation.
Metallurgical Program
Continued beneficiation testing with Mineral Technologies
Detailed mineralogical characterisation of tungsten-bearing phases
Particle size and liberation analysis to optimise processing strategies
Exploration and Project Development
Clearing and reopening the historic Springfield Mine access road
Completion of an electromagnetic (EM) geophysical survey targeting conductive mineralised zones
Preparation of applications for United States Government critical minerals funding programs, including Department of Defence initiatives
Submission of a Notice of Intent (NOI) and Plan of Operations to support Phase 1 drilling at the Springfield Prospect. Tungsten News
Previous Samso News Coverage – An Investor Lens
Samso has previously covered developments relating to Pioneer Minerals Limited (ASX: PMM) as the Company advances its North Pine Project in Idaho, USA, targeting tungsten, antimony and precious metals within a recognised critical minerals district.
The following Samso articles provide earlier coverage of Pioneer Minerals and the evolution of the North Pine Project:
27 December 2025 – Dual Mineral Systems Confirmed at Springfield as Pioneer Becomes PMM – A Tungsten Story that Needs Attention
11 January 2026 – Pioneer Minerals and the Search for America’s Next Tungsten System
February 2026 – Pioneer Minerals – $1.0M Capital Raise to Accelerate U.S. Critical Minerals Portfolio
These previous Samso publications highlight the progression of the North Pine Project exploration story, including the identification of tungsten and precious metal mineralisation at the Springfield Prospect, the Company’s strategic shift toward critical minerals, and its positioning within the United States supply chain narrative for strategic metals such as tungsten and antimony.
Samso Concluding Comments
The metallurgical test work undertaken at the Springfield Prospect focuses on evaluating the behaviour of tungsten contained within historic mine tailings generated during previous mining operations.
The results demonstrate that the tailings material contains tungsten mineral phases that can be significantly upgraded using gravity separation techniques. The Mozley table concentrate grading approximately 3.27% WO₃ represents a substantial increase relative to the composite head grade of approximately 0.21% WO₃.
Particle size distribution analysis shows tungsten enrichment in finer size fractions within the tailings material. This distribution reflects the historical processing methods used during the 1950s, which were designed to recover coarse tungsten grains while allowing finer particles to remain in tailings.
Heavy liquid separation results confirm that tungsten minerals present in the tailings occur in dense mineral phases that respond to gravity-based beneficiation methods. This observation supports the use of conventional mineral processing techniques for tungsten concentration.
The staged metallurgical test program is continuing and will include further mineralogical characterisation and optimisation studies aimed at better understanding tungsten mineral associations and processing behaviour within the Springfield system.
Market Implication - The Investor Lens
The Pioneer Minerals Limited story is one that I am watching closely both as a shareholder and a commentator. As most readers and followers of Samso will know, I am a big tungsten bull so any tungsten news is interesting. The tungsten space is slowly developing its own story as the price continues to rise. The value creation dynamics have changed and the way I look at economical means to create value for companies have changed.
Figure 5: The share price chart of Pioneer Minerals Limited as of the 10th March 2026. (source: commsec).
The share price movement for Pioneer Minerals will be hard to gauge as the disconnect between the tungsten demand/price value and investor acknowledgement is still not seen. It feels that there is a big valley in between what investors are thinking about and the reality of the criticality of tungsten.
The critical nature of finding an economical deposit is one thing but with the added pressure of geopolitical factors that are now enhanced with the Iran situation, this could make the rise of tungsten astronomical. Time will be the eventual fortune teller so keep your eyes on this space.
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