Pioneer Minerals Advances Springfield Project with Modular Processing Study

Modular Processing Study Targets Near-Term Production

Pioneer Minerals (ASX:PMM) has formally engaged Mineral Technologies Pty Ltd to conduct a processing concept study and plant design for its Springfield Project in Idaho, marking a critical transition from exploration toward development. The study aims to evaluate modular processing plant options that can rapidly produce a saleable tungsten (scheelite) concentrate from both historic tailings and fresh ore, emphasising capital efficiency and scalability.

The initiative builds on the company’s recent metallurgical test work, which demonstrated a 17.6-fold upgrade in tungsten concentrate from historic tailings, underscoring the potential for low-capital, fast-track production pathways. The study will deliver conceptual flowsheets, mass and water balance models, plant layouts, equipment sizing, and an order-of-magnitude CAPEX estimate with a ±50% accuracy range, providing a foundation for development decision-making.

High-Grade Multi-Critical Mineral System Confirmed

Recent reconnaissance rock chip sampling at Springfield has revealed significant gallium enrichment, with assays up to 128.7 ppm Ga₂O₃, alongside high-grade tungsten assays reaching 2.98% WO₃ and gold values up to 7.75 g/t Au. These results confirm a multi-commodity critical mineral system comprising tungsten, gallium, and precious metals, with gallium mineralisation occurring independently of tungsten pathways, indicating a previously unrecognised host phase.

The company’s strategy focuses on unlocking this multi-commodity potential through a staged development approach, initially targeting tungsten concentrate production while maintaining flexibility to recover gold and gallium as the project advances. This aligns with US government priorities on critical mineral supply chains, particularly given tungsten and gallium’s classification as critical minerals.

Near-Term Work Program Accelerates Project Momentum

Pioneer is advancing several parallel initiatives to support Springfield’s development. These include reopening the historic Springfield Mine access road to improve site logistics and reduce capital costs, conducting electromagnetic (EM) geophysical surveys to identify sulphide zones potentially associated with tungsten mineralisation, and preparing applications for US government funding programs, including Department of War initiatives aimed at bolstering domestic critical mineral supply chains.

The company has also commenced a maiden drilling program targeting historic stockpiles and newly identified geophysical targets. These activities build on recent progress such as the US Forest Service approval to reopen access road and the Plan of Operations submission for drilling, which collectively enhance exploration and development momentum.

Strategic Positioning Within US Critical Minerals Supply Chain

The Mineral Technologies engagement not only advances technical planning but also positions Springfield within the broader context of US critical minerals security. Pioneer’s involvement in government funding initiatives and alignment with Department of War priorities reflect the strategic importance of domestic tungsten and gallium production amid global supply chain concerns.

Additionally, the company’s prior collaboration with Mineral Technologies USA under a non-binding MOU laid the groundwork for this detailed processing study, focusing on beneficiation and recovery pathways critical to supporting US supply chains. This integrated approach underscores Pioneer’s intent to transition Springfield from promising exploration results to a scalable, near-term production operation.