QEM Limited’s review of the Big It Tungsten Project in Idaho reveals significant untapped high-grade tungsten, antimony, and gold mineralisation with extensive underground workings, setting the stage for a modern exploration campaign amid strategic supply concerns.
- Big It is a verified past US tungsten producer with high-grade concentrates
- Historical data show polymetallic tungsten-antimony-gold system with multiple oreshoots
- Extensive underground development offers cost-effective access for exploration
- Project remains underexplored with compelling untested depth and strike potential
- US government’s critical minerals policy underscores strategic importance
Historic Tungsten Mine Poised for Revival
QEM Limited (ASX:QEM) has completed a comprehensive review of the Big It Tungsten Project in northern Idaho, confirming the site’s status as a past producer of exceptionally high-grade tungsten concentrates. Historical shipments graded between 67% and 75% WO₃, supplying US wartime programmes, and extensive underground workings remain accessible. This positions Big It as one of the rare, government-documented tungsten producers in the United States, a country keen to rebuild its domestic critical minerals supply chain.
The project’s historical data reveal a polymetallic system rich not only in tungsten but also antimony and gold, with underground sampling returning values up to 2,980 ppm tungsten, 19.5% antimony, and 11.15 g/t gold. These findings highlight a complex hydrothermal vein system hosted in the geologically prospective Pritchard Formation, adjacent to the prolific Coeur d'Alene silver district.
Extensive Underground Workings Offer Exploration Advantage
Big It’s underground infrastructure is substantial, with approximately 380 metres of lateral development, including drifts, raises, and winzes, providing direct and cost-effective access to mineralised zones. Historical US government exploration in the early 1950s identified multiple high-grade tungsten oreshoots, including veins averaging 4.45% and 7.45% WO₃ over widths of 17 and 11 centimetres respectively. Despite this, the steeply dipping mineralised veins have never been systematically drilled beneath the existing workings, leaving significant depth and strike extensions untested.
QEM plans a phased exploration approach, starting with verification of historical data through detailed geological and structural mapping, underground and surface sampling, and reconciliation of a 2022 soil geochemical program that suggested a parallel gold anomaly. This groundwork will feed into targeted drilling campaigns aimed at confirming continuity and expanding the known mineralised system.
Strategic Importance Amid Global Supply Chain Risks
The timing of QEM’s work is notable given the global tungsten market’s dynamics. China controls over 80% of global tungsten supply, and geopolitical tensions have prompted the US government to announce a US$12 billion initiative to stockpile critical minerals, including tungsten and antimony. Tungsten’s uses span defence, industrial cutting tools, aerospace, and mining machinery, making secure domestic sources a strategic priority.
Antimony, another critical mineral present at Big It, faces similar supply vulnerabilities. China and Russia dominate global production and processing, with recent Chinese export bans to the US on refined antimony and ores exacerbating supply risks. Antimony’s applications in flame retardants, batteries, military munitions, and semiconductors add to its strategic value.
From Historical Data to Modern Exploration
While the historical data provide a tantalising glimpse of Big It’s potential, QEM acknowledges the limitations inherent in pre-modern sampling and reporting standards. The company will undertake rigorous verification, including surveying underground workings, systematic sampling, and modern analytical techniques to establish a robust geological framework.
Managing Director Robert Cooper emphasised the opportunity: “The underexplored nature of the project provides an excellent chance to apply modern exploration methods to unlock further mineralisation and potentially develop a domestic US tungsten supply.”
This initiative follows QEM’s recent acquisition of the Big It and Columbite projects, expanding its footprint in US critical minerals, including niobium, fluorspar, and rare earth elements, aligning with broader market trends to diversify supply chains away from dominant producers.
Bottom Line?
QEM’s methodical approach to validating and expanding Big It’s polymetallic system could position the company at the forefront of US critical minerals supply, but results hinge on successful exploration and modern verification of historical data.
Questions in the middle?
- Will QEM’s drilling confirm the continuity and extent of high-grade tungsten mineralisation at depth?
- Can the company verify and expand the parallel gold and antimony targets suggested by historical and recent sampling?
- How will evolving US government policies and funding impact the pace and scale of Big It’s development?