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The Sibanye-Stillwater company is betting on proximity over depth. The JSE-listed miner is advancing seven shallow, adjoining platinum group metals (PGM) projects across its South African portfolio, all focused on the upper group two (UG2) reef, mechanised where possible and deliberately structured as low-capital-intensity, brownfield extensions rather than new greenfield builds.
Executive Vice President and Head of Projects Ralph Lombard laid out the portfolio, noting the Siphumelele and Thembelani extension reserves projects and the Kopaneng and Bathopele extension resources projects, all in Rustenburg, the East 4 reserves project, plus the East 3 and Saffy extension resources projects, at Marikana. All are mechanised except Thembelani and all sit on contiguous Sibanye-Stillwater property, a detail that matters more than it might sound, since proximity is the entire basis of the strategy. Two secondary surface tailings recovery projects and two processing upgrades, a PMR upgrade and a smelter project for blend optimisation, round out the pipeline.
The logic Lombard outlined is straightforward: integration across mining boundaries unlocks additional value, shaft connectivity improves planning flexibility, sequencing, shared infrastructure and services improve economics while cutting complexity and production lead time. The acquisition of 100% of the Kroondal PGM mine and its integration into the Rustenburg operation is a direct application of that thesis, enabling cross-boundary operational synergies and pulling forward value from combined resources.
Siphumelele is the clearest live example. Currently in execution, the project consolidates the Bambanani and Siphumelele operations into a single mining complex, enabling full extraction of the Bambanani reserve. The first blast landed a month ahead of schedule in May, with connection to the Bambanani mine targeted for June 2028. Production is expected from March next year, with the capital programme scheduled for completion by January 2031. On the numbers, the R2.8 billion capital outlay is expected to pay back within seven years, against a mine life extending to 2039, a net present value of R2 billion and a calculated internal rate of return of 40%.
The Kroondal/Rustenburg boundary tells a similar story: mining through the old boundary unlocks synergies between the operations and shared services reduce unit costs for both. Lombard flagged the K4 Marikana project as another near-term catalyst, “What’s quite exciting is seeing our K4 Marikana project, which in our half-year results will show a positive contribution from this year onwards, which is part of the good news as we keep on developing these projects.”
A recurring theme across the portfolio is capital efficiency through reuse. This is because Merensky reef mining historically preceded UG2 extraction in these areas, significant legacy infrastructure is already in place and being repurposed, lowering capital costs relative to a fresh build. Lombard was explicit that the strategy avoids technical risk by design, saying, “We’re not trying new mining methods. We know quite well how to do mechanised low-profile mining as well as board and pillar mining, and with that also comes the benefit of an experienced workforce, which is one of the other benefits we have by operating in this brownfield environment, which can assist us tremendously as we ramp up these projects and these crews move down dip.”
All seven projects are shallow to intermediate depth, with no deep-level PGM mining planned at this stage, orebody declines of nine to 13.5 degrees across the Rustenburg/Marikana area support continued mechanised mining without the cost and risk escalation that comes with going deeper. “We also have the ability to combine mines to become one solid mining unit again and bring us a good return on capital and payback,” concluded Lombard. With Siphumelele and Thembelani already in execution and Thembelani’s stopping crews already contributing to revenue, Sibanye-Stillwater’s brownfield strategy is less a bet on discovery than a bet on extracting maximum value from ground it already knows intimately.
