Sibanye-Stillwater approved two mines on two continents on the same day — without buying a single company

The South African miner gave simultaneous green light to the Mt Lyell copper-gold project in Tasmania and the Burnstone gold project in South Africa — both funded with the company's own capital and reusing infrastructure from century-old mining districts.

Sibanye-Stillwater announced the simultaneous approval of two projects on different continents on September 2, 2026. Mt Lyell, in Tasmania, is a copper-gold project that received board approval after completion of an AACE Class 2 feasibility study and an internal assurance review — execution begins in the first half of 2027, with first metal expected in early 2029. Burnstone, in South Africa, is a gold project that received a positive investment decision after an updated feasibility study; mining begins as early as 2026, with the processing plant starting operations in the first quarter of 2029.

Both projects illustrate the same development logic: reusing infrastructure from mining districts that have existed for more than a century instead of opening an entirely new front. Mt Lyell has been mined since 1893 and hosts ore bodies whose names trace back to the district's history — Prince Lyell, Western Tharsis, Cape Horn, Copper Chert; Burnstone sits in the Witwatersrand, the most productive gold basin in mining history. This lowers the initial capital required (US$340 million through to production at Mt Lyell; R$98 million just for 2026 at Burnstone) and shortens the timeline compared with an equivalent greenfield project, because roads, power and part of the geological understanding of the terrain already exist. The case is also a practical lesson in how a mining project's economics move together with the metal price: Mt Lyell's internal rate of return, calculated at 20% under the feasibility study's conservative assumptions (NPV of US$550 million), rises to 28% at current spot prices — with NPV climbing above US$1 billion. Burnstone, for its part, shows a 36% IRR and an NPV of R19.2 billion, numbers that help explain why the company prioritized both projects at once rather than choosing just one. Behind the decision lies a broader strategic choice, put into words by CEO Richard Stewart himself: rather than compete in mergers and acquisitions processes — expensive and competitive, especially for copper and gold assets amid a price rally — the company prefers to develop the portfolio it already holds. COO Richard Cox summed up the risk logic behind it: the two projects represent "reserve replacement and shallower, lower-risk ounces" to offset the natural depletion of the company's deep, conventional mines.

For mature miners with portfolios in historic districts, the case shows that redeveloping assets with leftover infrastructure can compete head-to-head with acquisitions on a risk-adjusted return basis — without the premium normally paid in competitive M&A processes. The decision to run two projects at once, rather than sequencing them, also signals confidence in the company's balance sheet and in its read that copper and gold prices should stay favorable at least through the start of production, between 2026 and 2029. For anyone evaluating mining projects, the two cases side by side serve as a reference for how the same capital allocation discipline — use what already exists, measure returns against the market price, not just the feasibility study's assumption — applies across completely different geographies, metals and investment scales.