South Africa chrome mine cave-in: geotechnical failure lessons for engineers
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Fourteen illegal chrome miners were found dead and at least eight injured after a cave-in near an abandoned shaft by the Nkaneng informal settlement, close to Marikana in South Africa’s North West province, with the collapse estimated around 21:00 on Monday. Police have intensified action against illegal chrome operations in the province, seizing 20 trucks and 15 excavators over the past two years and arresting survivors on suspicion of illegal mining. The incident underlines ongoing geotechnical and safety risks where informal miners re-enter abandoned gold, platinum and chrome workings without ground support or regulated access control.
Technical Brief
- Incident occurred in a legacy mining belt where abandoned gold and platinum workings are routinely re-entered.
- Illegal chrome extraction is linked with illicit washing plants, implying uncontrolled tailings, slimes and slope instabilities.
- Operations ran entirely outside regulated ground support, ventilation, gas monitoring and emergency egress requirements.
- Investigation will rely on police and mine inspectorate shaft mapping, eyewitness timelines and collapse-zone geotechnical inspection.
- Remediation and monitoring options are limited by informality but would typically include shaft sealing, fencing and surface subsidence surveys.
Our Take
In our Hazards coverage, South Africa features disproportionately for informal or illegal workings around chrome and PGMs, signalling that shallow, high-value reef remnants near settlements like Marikana remain a persistent geotechnical and policing challenge even where formal mines have modern safety systems.
The seizure of 20 trucks and 15 excavators over two years in North West suggests a semi-industrial scale to illegal chrome extraction, which typically implies more extensive, destabilising underground voids than hand-dug pits and therefore higher collapse risk for nearby infrastructure and communities.
The inclusion of Lake Victoria’s Tembo with 600 koz gold in the same data set underlines that artisanal and illegal activity is not confined to chrome in South Africa; in our database, several Africa-tagged Hazards items link unregulated workings to commercially significant gold and copper resources, complicating future formal project development and ESG risk assessments.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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