Greenbushes Output Cut Triggers 14% IGO Plunge as Lithium Supply Pressures Mount

Australian miner IGO Ltd. saw its shares plunge as much as 14% after delivering a significant downgrade to full-year production guidance for Greenbushes, the world's largest hard-rock lithium mine. The sharp market reaction reflects investor anxiety over tightening supply from a critical node in the global electric-vehicle supply chain. IGO attributed the guidance cut to operational challenges at the mine, without elaborating on specific factors behind the downgrade.

Greenbushes holds outsized importance in lithium markets. Located in Western Australia, the mine is majority-owned by China's Tianqi Lithium, with IGO holding a 24.5% stake. The operation supplies a substantial share of the world's lithium hydroxide, a key input for high-performance EV battery cathodes. Any sustained reduction in output from Greenbushes risks compounding broader supply deficits that have already kept lithium prices elevated despite recent volatility. Industry analysts had already flagged supply tightness as a persistent concern heading into 2025.

The guidance revision places additional pressure on an EV supply chain already grappling with material-cost uncertainty. Manufacturers reliant on lithium-ion batteries have been watching raw-material availability closely as they scale production targets. Market participants noted that the timing of the cut—coming ahead of anticipated demand cycles—heightens its significance. IGO officials indicated that the company is working to address operational issues but provided no firm timeline for a recovery to prior guidance levels. The stock slide has drawn attention to concentration risk in lithium supply chains, where a small number of mines and producers control a disproportionate share of global output.