Alcoa sparks critical minerals boom in WA

Western Australia is establishing itself as a significant player in the global gallium market, currently controlled by China, following Alcoa’s approval of a new processing plant at its Wagerup alumina refinery.

The Pittsburgh-based firm’s final investment decision this month allows construction of a 100-tonne-per-year gallium facility, supported by funding from Australia, the U.S., and Japan. The project will position Australia among the largest producers outside China of a metal vital for semiconductors, defense systems, and advanced electronics.

Gallium does not occur in concentrated deposits. It is extracted as a byproduct of bauxite and zinc refining, creating supply-chain constraints. China accounted for 98% of global primary refined gallium production in 2023, according to U.S. Geological Survey data. When Beijing introduced export controls last year, European prices rose to about five times Chinese levels.

The Wagerup plant will not resolve this imbalance alone. Its output represents roughly 10% of global demand, but its importance lies in creating commercial-scale processing, expertise, and international customer networks in Western Australia. The facility may encourage other projects, helping the state become a critical minerals hub.

Alcoa benefits from vast bauxite resources in the region, which supply its alumina refineries. Gallium is recovered from Bayer-process liquor during refining, eliminating the need for separate mining. The company’s planned acquisition of South32’s aluminum business would further increase its resource base.

For smaller companies, Alcoa’s decision marks a change. A market once considered too small to fund now offers a viable development path, including government support and strategic offtake agreements. The U.S. has pledged up to $200 million in concessional equity through Export Finance Australia, while Japan’s involvement includes a partnership between its government and trading house Sojitz, with funding tied to future output rights.

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This backing is important. The Center for Strategic and International Studies has noted that China could flood the small, opaque gallium market to drive prices down. Alcoa’s investment does not remove that risk, but it demonstrates that Western Australian projects can attract serious capital when aligned with strategic priorities.

Nimy Resources is one of the most advanced juniors pursuing gallium, though its approach differs from Alcoa’s. Instead of relying on bauxite refining, Nimy plans to become a rare primary producer, extracting gallium directly from ore at its Mons project, 370 kilometers northeast of Perth.

Nimy Resources managing director Luke Hampson said the development strengthened the position of WA explorers seeking alternative supply. “Alcoa’s commitment to the gallium production plant reflects the strong outlook for this critical metal and the need for the western world to develop alternative supplies to China,” he said.

Metallurgy remains the biggest challenge. Alcoa’s plant uses an existing Bayer-process stream, where gallium is already dissolved in the liquor. Nimy must develop an ore-based flowsheet capable of mining, concentrating, and recovering gallium at a commercially viable cost. The process also requires refining to 5N to 8N purity for semiconductor supply chains, depending on the end use.

Without downstream refining and semiconductor-material capacity, Western Australia risks relocating rather than solving the supply-chain bottleneck. The state’s ambitions depend on whether juniors can develop cost-effective recovery methods and secure long-term buyers.

Other explorers are taking different approaches. Mount Ridley Mines holds the largest resource, with 838.7 million tonnes grading 29.3 parts per million gallium for 24,584 tonnes of contained metal at its Grass Patch project near Esperance. The site also contains rare earths and scandium, making it a potential multi-mineral operation. Phase 2 testwork, scheduled for 2026, will focus on scandium re-assaying and could expand the resource.

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West Cobar Metals has outlined a 263-million-tonne inferred resource at its Salazar project, where gallium is part of a broader suite of rare earths, scandium, titanium, and alumina. The company must prove consistent recoveries and commercially viable multi-product flowsheets.

Earlier-stage players like Terrain Minerals and Western Yilgarn are still defining their resources. Terrain’s Larins Lane discovery at Smokebush has returned intersections up to 64 meters wide, with metallurgical results expected in late 2026. Western Yilgarn targets gallium-rich zones within its 205-million-tonne bauxite portfolio, with recent assays from its Cardea 1 deposit showing high-grade accumulations.

Western Yilgarn non-executive director Pedro Kastellorizos said the growing demand for gallium in semiconductors, defense technologies, and advanced electronics makes Cardea 1 a potentially significant Australian project with strong strategic relevance.

The focus remains on proving recovery methods. Mount Ridley’s Phase 1 testwork, led by veteran metallurgist Chris Larder, is evaluating mineral characterization, beneficiation, and leaching. The aim is repeatable recoveries and a saleable product without prohibitive costs. Success could set a standard for other Western Australian projects.

The next two years will determine whether the state’s gallium push can move beyond pilot plants. Alcoa’s decision has created an opportunity, but realizing it will require processing breakthroughs, offtake agreements, and a supply chain that extends beyond the mine gate.

Hampson added that Alcoa’s commitment reflects the strong outlook fo