Tharisa underground chrome and PGM project extends Bushveld mine life

Tharisa

Tharisa underground chrome and PGM project plans mark a major shift in its South African operations. The Tharisa underground chrome and PGM project will replace the existing open pit mine as it depletes, securing long-term output from the Bushveld complex. This strategic move aims to stabilise chrome and PGM supply while leveraging stronger platinum prices and future demand growth.

Long-life strategy for Bushveld chrome and PGM supply

Tharisa will invest $547mn over the next decade to develop the underground complexes, Apollo and Orion. These underground units will enter first production in 2031, as the open pit approaches depletion. The Tharisa underground chrome and PGM project is designed to match and then exceed the current 5.6mn t/yr ore mining capacity.

As a result, Tharisa expects to maintain existing chrome and PGM concentrate output levels and create room for expansion. The underground expansion will extend the life of the overall operation by more than 50 years. This life extension is critical for downstream smelters, refiners and automotive PGM users planning long-term contracts.

Recent production trends highlight why the transition matters. PGM output fell by 6.5pc year on year in April–June, with chrome concentrate down by 3.9pc. However, quarter-on-quarter volumes recovered, with PGMs up 6.2pc and chrome concentrate up 3.9pc from January–March. The Tharisa underground chrome and PGM project therefore seeks to smooth volatility and anchor a more predictable supply profile.

Platinum price strength supports underground investment case

Platinum prices have recently surged to their highest level in 11 years. Benchmark assessments put platinum around $1,592/troy oz, with palladium at $1,285/troy oz. This price environment strengthens the economic rationale for deep, capital-intensive underground development.

Therefore, the Tharisa underground chrome and PGM project benefits from supportive revenue expectations, even as near-term production dips. Underground operations typically deliver higher resource recovery and better grade control than mature open pits. Over time, this can offset higher operating and capital costs.

Meanwhile, chrome concentrate remains a key revenue pillar for Tharisa, tied to stainless steel and alloy demand. The combined chrome and PGM basket from the Tharisa underground chrome and PGM project will help diversify risk across stainless, auto catalyst and emerging hydrogen-related applications. For global buyers, this project adds another long-dated node of supply in a market wary of concentration risk.

The Metalnomist Commentary

Tharisa’s move underground signals confidence in long-run PGM and chrome fundamentals despite short-term market noise. For downstream users, the key questions will be project execution, cost control and how this new supply interacts with other Bushveld and global expansions. If delivered on schedule, the project should reinforce South Africa’s role at the core of the PGM and chrome value chain well into the second half of this century.