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17.02.2026

Sibanye-Stillwater Mineral Resources and Mineral Reserves declaration as at 31 December 2025

[PDF] Press Release: Sibanye-Stillwater Mineral Resources and Mineral Reserves declaration as at 31 December 2025

Johannesburg, 17.02.2026 (PresseBox) - Sibanye-Stillwater (Tickers JSE: SSW and NYSE: SBSW) is pleased to report attributable Group Mineral Resources and Mineral Reserves as at 31 December 2025.

The declared Mineral Resources and Mineral Reserves for the Group's managed operations and projects are the outcome of a detailed annual operational and life of mine (LoM) planning process and are indicative of the considerable underlying mineral assets base which supports sustainable, long-life production. In addition, attributable Mineral Resources and Mineral Reserves are also declared based on our legal interest in non-managed mineral properties.

This Mineral Resources and Mineral Reserves declaration represents a condensed and consolidated summary of the full Sibanye-Stillwater Mineral Resources and Mineral Reserves declaration, which will be available in the Group Mineral Resources and Mineral Reserves Report. The report will be published on 24 April 2026 at www.sibanyestillwater.com/news-investors/reports/annual/.

1. Salient features

4E PGM Mineral Resources of3Moz (-2.0%) and Mineral Reserves of 29.4Moz (+4.7%) at our SA PGM operations

The inclusion of the Marikana E4 mechanised UG2 project Mineral Reserves added +2.9Moz to Mineral Reserves following the completion of a feasibility study

2E PGM Mineral Resources of 9Moz (+2.2%) and Mineral Reserves of 19.4Moz (+2.1%) at our US PGM operations

Gold Mineral Resources of 4Moz (-25.5%) and Mineral Reserves of 9.4Moz (-6.3%) at our SA gold operations (including DRDGOLD) and development projects (including Burnstone)

At the Kloof operation, production constraints, including geotechnical considerations which led to the removal of isolated blocks of ground, have impacted the economic viability of the operation, leading to a writedown of the majority of the Mineral Reserves (-1.4Moz)

Uranium Oxide (U3O8) Mineral Resources of 59.3Mlb (+0.1%) and Mineral Reserves of 25.2Mlb at our SA gold operations

The maiden uranium Mineral Reserve is based on the completion of the Cooke TSF feasibility study

Lithium Mineral Resources of 510kt lithium carbonate equivalent (LCE) (-24.0%) and Mineral Reserves of 248kt (unchanged)

The change in Mineral Resource is informed by the disposal of our interest in Ioneer Ltd (-201kt) and an updated Mineral Resource estimate at the Keliber lithium project (+40kt) in Finland following successful exploration

Zinc Mineral Resources of 963kt (-17.4%) and Mineral Reserves of 308kt (-44.2%)

Informed by the ongoing depletion of the tailings Mineral Reserve at the Century operation, which now has ~18 months of reserve life left

Copper Mineral Resources of 5,500kt (-31.1%) and Mineral Reserves of 478kt

At the Mt Lyell copper project in Tasmania, Australia, the completion of the feasibility study has resulted in a maiden Mineral Reserve under Sibanye-Stillwater

At the Altar project in Argentina, a reduction in project ownership (40% to 20%) following a further earn-in by Aldebaran Resources, has resulted in an attributable Mineral Resource reduction (-2,478kt)

For further information, please refer to the attached PDF file.

Ansprechpartner

Marc Ollinger
+41 (71) 354-8501

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[PDF] Press Release: Sibanye-Stillwater Mineral Resources and Mineral Reserves declaration as at 31 December 2025

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