Greenbushes downgrades production guidance as ore grade decline accelerates

Greenbushes, the world’s largest hard-rock lithium mine, is struggling with a structural decline in ore feed grade that is now materially impacting production and costs. IGO announced this week that spodumene concentrate output for Q1 was 351kt, prompting a full-year FY26 guidance cut to 1,375–1,425kt from 1,500–1,650kt. Benchmark’s Q1 2026 lithium supply forecast had Greenbushes at approximately 270,000 tonnes LCE for 2026 calendar year, underpinned by 1,850kt of spodumene concentrate across the year. The March quarter result, and the likelihood of a softer Q2, means the first half of 2026 is now tracking approximately 170kt SC below our forecast, equivalent to a shortfall of roughly 25,000 tonnes LCE.