Summary

Mine Type	Underground
Status	Care and Maintenance
Commodities	Gold
Mining Method	Breast mining Scattered stoping
Mine Life	...
Snapshot	Burnstone is a shallow, developmental-stage gold mine and processing operation. Formerly an active mine until being placed on care and maintenance in mid-2012, Burnstone includes two established shaft complexes, a carbon-in-leach gold processing plant, a tailings storage facility, and associated surface infrastructure and mining rights. Following an updated Feasibility Study, the Sibanye-Stillwater Board gave approval for the continuation of the Burnstone project in early 2021. Consistent with the requirements of the Group’s capital allocation framework, development of the project was deferred following the capital review in H2 2023. The Project remained on care and maintenance during 2024 and due to the lower prevailing PGM precious metal prices, the Group decided to continue deferring the capital expenditure at Burnstone during 2025.

Deposit type

• Paleoplacer

Summary:

Burnstone lies within the Witwatersrand Basin and Archaean (2.7 billion year-old) sedimentary basin. The Basin is filled with approximately 14,000m sedimentary and subordinate volcanic rocks, which have been folded along a north east to south-west axis into an asymmetrical synclinorium. The sediments consist mainly of quartzites and shales and less prevalent, but generally economically important, gold-bearing conglomeratic zones, which occur on regional unconformities. These are commonly referred to as reefs or placers.

Burnstone is located in the South Rand Basin, a subsidiary of the main Witwatersrand Basin. The gold-bearing target UK9 Reef of the Kimberley Formation, occurs in the Central Rand Group of rocks. This reef lies between the outcrop and a depth of 1,300m below surface in the mining right area. Structurally, the project area is located on the northern limb of the arcuate South Rand Basin, which is locally deformed by a east-north-east-plunging anticline and cut by east-west and north-south normal faults, formed in response to the stress regime corresponding to the main structural feature of the region, which is the east-west striking Sugarbush Fault. This fault is a left-lateral wrench fault, which comprises the northern boundary of the South Rand Basin at this point.

Shallow gold deposit exploiting the UK9a Reef of the Kimberley Formation, Central Rand Group, Witwatersrand Supergroup.

The UK9a Reef is a thin (<1m), highly channelised, shallow dipping (<10º) orebody. The minimum mining cut includes waste to a total of 110cm.

Mining Methods

- subscription is required.

Comminution

Crushers and Mills

- subscription is required.

Processing

- subscription is required.

Commodity Production

Operational metrics

Metrics
Annual mining capacity	....
Annual ore mining rate	....
Plant annual capacity	....

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		May 1, 2025