Sibanye Stillwater : Environmental incidents in 2023

GROUP

SUPPLEMENTARY INFORMATION 2023

ENVIRONMENTAL INCIDENTS IN 2023

NO LEVEL 4 OR 5 ENVIRONMENTAL INCIDENTS OCCURRED DURING 2023

		Operation/
	Incident
No Incident date	Description	Remedial action taken		Current status
level	site

SA PGM operations - one incident at Klipgat return water dam (RWD) as described below

1	8 February 2023 Level 3	Rustenburg
operation

Klipgat return water dam (RWD) was reported to be overflowing on	• Action plan in place to desilt the dam,
8 February 2023 after excessive rainfall (68mm) and three plants were down,	remove reeds, and review water balance
impacting the recirculation. The overflow entered the non-perennial Klipgat	and reticulation systems to assess
spruit and Hex river.	freeboard levels

The reed removal was successfully completed in December 2023; de-silting of RWDs at Paardekraal and Klipgat planned for completion in Q4 2024.

SA gold operations - no level 3 or above incidents

US PGM operations - one incident at the Stillwater mine as described below

2	12 August 2023 Level 3	Stillwater
mine

A storage tank containing used compressor oil leaked all of its contents onto site soils. The source of the spill was a 300 gallon tote comprised of spent compressor oil and water. The exact amount of oil spilled is unknown, because it was mixed with water in the tote; but it was determined that the quantity of petroleum product was greater than 25 gallons.

• 915 cu. meters of contaminated soil was excavated from the site and transported to a certified treatment facility
• Soil samples were collected before, during, and after site soil excavation to verify that the site clean-up met regulatory standards

Site mitigation was completed and this incident was closed out in April 2024.

Close-out of previously reported incidents

• US PGM operations: In the 2022 version of this supplement, we reported a level 3 incident at the Stillwater mine which occurred on 30 October 2022. Snow and frozen conditions prevented final clean-up and close out prior to the end of the year. During 2023, mitigation of affected soils in this area was completed and this incident was closed out
• SA gold operations: In the 2022 version of this supplement, we reported a level 4 incident (dam failure) at the Beatrix operations that occurred on 19 January 2022. During 2023, outstanding actions relating to this incident were completed. These actions entailed improving upstream water management (which is outside the scope of our operations and made possible through engagement with other stakeholders), and the implementation of engineering interventions to restore integrity to water management infrastructure

For more information on our actions to minimise our environmental impact, please refer to the 2023 Integrated report, www.sibanyestillwater.com/news-investors/report/annual

FOR MORE INFORMATION, CONTACT:

James Wellsted

Executive Vice President:

Investor Relations and Corporate Affairs

Email: [e-mail]

Website: www.sibanyestillwater.com

OUR VISION:

To be a leader in superior shared value for all stakeholders

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