Korea Shops Down Under for Its Battery Future

Mineral Resources and POSCO Holdings have signed a binding joint venture agreement covering the Wodgina and Mt Marion hard-rock lithium mines in Western Australia, with the South Korean conglomerate paying US$765 million for a 30 percent stake in the new entity. Mineral Resources retains a 70 percent majority and continues as operator of both sites.

The deal grants POSCO proportional access to spodumene concentrate, the raw feedstock for battery-grade lithium chemicals, feeding its processing operations in Korea and elsewhere. Mineral Resources chair Malcolm Bundey called it the first major Korean company investment into Australian hard-rock lithium, describing it as a milestone in bilateral critical minerals cooperation.

The implied valuation of Mineral Resources' combined 50 percent ownership across both mines stands at roughly US$3.9 billion, a signal of institutional confidence in Australian spodumene assets despite weak near-term prices.

For Mineral Resources, the proceeds are earmarked for debt reduction. Net debt is projected to fall from approximately A$5.4 billion to around A$3.7 billion by end of 2026, restoring financial headroom at a time when the company has faced significant balance sheet pressure.

POSCO Holdings' rationale is strategic as much as financial. The transaction extends a raw material security programme spanning hard-rock assets in Australia and brine operations in South America, reducing reliance on spot market purchases. POSCO Holdings chief executive In Hwa Chang described the partnership as combining both companies' capabilities to drive sustainable growth in the energy materials industry, a business line the group has positioned alongside its core steel operations as a primary growth driver.

The joint venture builds on an existing relationship between the two companies through the Onslow Iron project in Western Australia.

Completion is subject to final documentation and Foreign Investment Review Board approval, with closing expected in the first half of 2026. Whether the structure becomes a template for other allied-nation equity arrangements in Australia's critical minerals sector will depend in part on how the regulatory and pricing environment evolves over that period.