By Daina Beth Solomon

SANTIAGO, Dec 9 (Reuters) – Chilean authorities in August raised concerns over a large crack and leaks at Teck’s flagship Quebrada Blanca copper mine and criticized the miner for not immediately reporting the issues, according to documents reviewed by Reuters.

The crack and leaks were alarming enough to lead some workers to ask mining regulator Sernageomin to investigate potential safety risks, according to five complaints between ‍July 28 and August 8.

The mine has had problems since 2024 at its tailings dam – an embankment that stores mine waste – causing Teck to cut production guidance at Quebrada Blanca.

In response to questions from Reuters, Teck said the tailings dam is stable and safe, and construction is proceeding.

“There was never any risk to the safety

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