Mimosa Mine is a Platinum Group Metal (PGM) and base metal mining operation located in the Wedza sub-chamber of the Great Dyke in Zimbabwe. The Wedza sub-chamber is the southernmost of four sub-chambers within the Great Dyke, and it hosts the economically significant Main Sulphide Zone (MSZ), from which PGMs and base metals are explored and mined. The Mimosa operation comprises four mineral deposits: North Hill, South Hill, Mtshingwe Block, and Far South Hill. Current operations are located at South Hill.
A mechanised bord-and-pillar mining method is used to extract ore, with an average stoping height of 2.1 meters and an annual production rate of approximately 2.9 million tonnes. The mine operates on a two-shift system. The mining cycle involves mechanised support drilling and installation, mechanised face drilling, charging and blasting, followed by mechanised lashing and ore conveyance to the strategic surface stockpile.
Mimosa Mine’s concentrator also processes 2.9million tons of ore per year. The key operations within the concentrator are crushing and screening, milling, flotation, thickening, and filtration. The concentrator is configured into a two-stage milling and floatation circuit to achieve maximum efficiencies. The flotation plant yields a final concentrate with approximately 238koz of PGMs per year. The final concentrate is thickened and dewatered via pressure filters before being transported to the third parties for further processing. The residual material is pumped for deposition onto a 145-hectare slimes dam.
Mimosa adheres to ISO 45001 (occupational safety), ISO 14001 (environment safety), and ISO 50001 (energy management) standards, ensuring systematic risk control, environmental protection and energy efficiency. These frameworks drive responsible operations aligned with global sustainability goals, prioritizing worker safety, ecological stewardship, and sustainable development in Zimbabwe’s mining sector.
Our History
1926
Earliest record of Platinum mining by the Granger Brothers.
1966
Trial Mining was undertaken by Union Carbide Zimbabwe between 1966 to 1975
1993
Mimosa was acquired by Zimasco from Union Carbide.
1994
The pilot plant was refurbished. Production rises to 6000 tonnes of ore per month.
2001
Aquarius Platinum (AQP) acquired 50% shareholding in Mimosa. The status was a 50:50 joint venture between Implats and AQP.
2002
Wedza Shaft established June 2002.
2009
Plant Upgrade (185 000 tonnes per month)
2010
Blore shaft belt upgraded to a throughput of 600 tonnes per hour from 350 tonnes per hour
2013
Mimosa partners Friends of the Enviroment to establish Mtshingwe nursery to champion empowerment and self-sustenance.
2016
Aquarius Platinum was acquired by Sibanye Stillwater, resulting in Sibanye Stillwater 50% and Implats 50%
2017
Establishment of 2nd Egress Shaft System
2018
Livestock revitalization programme launched in partnership with the Zimbabwe Agricultural Society
2021
Mimosa achieved Zero Harm Milestone in April 2021 after recording 365 consecutive days without a loss time injury.
2022
Plant optimisation to enhance metal recoveries. Additionally, introduced LED initiative to support local enterprises launched.
2024
TSF4 completed and commissioned.
Corporate Signature
The Mimosa tree, after which our company is named is popular for its fragrance and elaborate flowers which attract bees and butterflies, giving them life. Likewise, we strive to provide growth and superior returns to all our stakeholders and our environment. We continue to work in line with relevant policies and guidelines regarding responsible and ecologically friendly business practices.