The rhodium market has a supply problem that money alone cannot fix. The metal is never mined for itself — it rides along as a trace by-product of platinum and palladium production, typically yielding just one part rhodium for every 15–20 parts of combined PGMs. That means every mine closure, shaft rationalization, or output cut at a South African PGM operation directly reduces rhodium availability, regardless of how high rhodium prices climb or how urgently buyers need it.
All three of South Africa's major producers are actively shrinking their operational footprints. Sibanye-Stillwater has been restructuring deep-level shafts at its Kroondal and Rustenburg operations, where aging infrastructure and rising costs have made marginal ounces uneconomical at mid-cycle PGM prices. Impala has implemented similar rationalizations across its Rustenburg lease area, and Anglo American Platinum has been consolidating processing capacity around its most productive Mogalakwena and Amandelbult assets while letting higher-cost shafts run off. The cumulative effect is a material reduction in the ore base from which rhodium is recovered.
Johnson Matthey's latest PGM market report forecasts South African primary platinum output declining roughly 3% in 2025, with similar headwinds carrying into 2026 for rhodium. For a market as small and illiquid as rhodium — annual mine supply barely reaches 600,000–700,000 ounces globally — even a 3–5% supply contraction can create outsized price dislocations. The structural nature of these cuts, driven by decades-old ore-body depletion and cost inflation rather than temporary maintenance, suggests this supply constraint will persist through at least 2027.