Colombia gold mine collapse: slope failure lessons for geotechnical teams
Reviewed by Tom Sullivan

First reported on MINING.com
30 Second Briefing
A slope collapse at an open pit gold mine near Policarpa in Colombia’s Nariño department has killed 13 workers and injured seven, after a night-time landslide buried crews who were later recovered by firefighters and residents using excavators. Local authorities have not confirmed whether the operation had mining permits, despite witnesses saying around 50 people, mainly from the Quillacinga Indigenous group and including four victims from one family, regularly worked the site. The incident again exposes geotechnical and safety risks at Colombia’s largely unregulated artisanal and illegal gold mines, which involve an estimated 200,000–400,000 people.
Technical Brief
- Failure mechanism was confirmed as a night-time open-pit slope landslide, after initial reports suggested an explosion.
- Search and recovery continued until about 2 a.m. using excavators alongside firefighters and local residents.
- Site is in a rural area of Policarpa, Nariño, complicating rapid access for emergency and technical teams.
- Ongoing monitoring at similar pits would typically require visual slope inspections, basic survey control and rainfall-triggered work stoppage protocols.
Our Take
With 13 fatalities at a relatively small open pit employing about 50 regular workers near Policarpa, this Colombia gold incident sits at the severe end of the 26 Hazards stories in our database and signals that small-scale operations in Latin America can carry disproportionate life-safety risk compared with larger, more formalised mines.
The note that four of the dead belonged to the same Indigenous family underlines how gold and gemstone extraction in regions like Nariño often overlaps with Indigenous territories, which typically complicates both emergency response and subsequent compensation or resettlement negotiations.
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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