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Codelco Chile halts El Teniente expansion due to new seismic risks

Codelco Chile halts El Teniente expansion due to new seismic risks
Codelco Chile halts El Teniente expansion due to new seismic risks

Codelco, the state-run copper mining company in Chile, has suspended one of its expansion projects for its flagship El Teniente Mine a year after a fatal 'collapse. Recent studies have shown a greater seismic risk than originally thought.

Six workers were killed in an accident that occurred on July 31, 2025. This forced Codelco, the world's largest underground copper mine at the time, to stop production across various sections.

Codelco said it chose to put expansion work within the Andes Norte?section of the'mine on hold in order to ensure worker safety. Citing analyses conducted over the last six months, which 'point out seismic risks related to depth of deposit, that are different from those previously identified and monitored.

Codelco stated in a press release that the available evidence supports the possibility of an emerging risk related to the deeper depth of the Andes Norte Project. The company added that they would continue studying the issue. Codelco said that the analyses had revealed the existence of a new seismic phenomenon, with different characteristics from those risks which have been managed and known historically.

Andes Norte is located near the Andesita section and Teniente 7 section that was most affected by this collapse. The impact of the collapse was equivalent to a magnitude 4.2 earthquake. Codelco is facing criminal, regulatory and technical investigations. It's still investigating what caused the disaster.

In order to increase production, mining companies are turning more and more to deep underground operations.

El Teniente is a more than 100-year-old tunnel system that spans over 4,500 km (2,800 mi) of?tunnels in the Andes Mountains. About 75 kilometers (47miles) south of Chile's capital Santiago, it is located. Reporting by Daina Solomon in Mexico City, Fabian Cambero from Santiago and Inigo Alexander.

(source: Reuters)