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Workers and Chilean regulators flagged the risk of Teck's Quebrada Blanca Dam

Documents reviewed by the.

Five complaints were filed between July 28 and august 8 about the cracks and leaks.

Teck has cut the production guidance for Quebrada Blanca because of a tailings embankment problem that's been occurring since 2024.

Teck responded to questions by saying that the tailings dam was stable and safe and construction is progressing.

Teck said that there was no risk to the employees or the facility's safety.

The documents obtained through a request for public records from Sernageomin also show Teck's response to the regulator, stating that the problems had been resolved and that the workers were no longer at risk.

Initial concerns of workers were a result of a leak in late July.

Sernageomin received a letter from a worker on July 28 stating that the dam wall was leaking.

Sernageomin said that the inspection of August 1 was partly prompted by this complaint as well as a second complaint about lack of personal protective equipment.

Workers continued to complain in the days that followed, including starting on August 3 about a large crack along the top wall.

One complaint stated that the information provided by the company was not clear.

Sernageomin received a letter from another person: "Teck employees ignore all that is happening and don't want stop producing." I beg you to come to work."

Sernageomin inspections conducted on August 1 and 2 identified a horizontal crack that ran 240 meters (790 feet) across the top of the main wall. This left an 18-centimeter hole. The inspection also discovered pools of water near the base of the dam wall and criticised Teck for failing to report the problems quickly.

In a signed inspection report by Sernageomin representatives and Teck representatives, the company stated that it must notify the service immediately of any incidents.

In a report of follow-up dated 5 August, Sernageomin stated: "This Service is concerned with what was observed on the field in regards to operational findings on deposit wall. Specifically the water seepage on the crest."

According to documents reviewed by, Teck began sending weekly monitoring reports to Sernageomin in early August.

Teck stated in its reports, letters, and presentations to Sernageomin as well as the minutes of weekly meetings held with representatives of regulators that it had conducted drills for scenarios of structural collapse and was preparing a root cause analysis of the leaks and cracks.

Teck said the cracks which appeared at the end of July were normal for this type dam construction. They were repaired quickly. It also fixed a leaky pipeline that "resulted" in water discharge around that time.

Teck stated that "work is proceeding as planned to allow full ramp-up for QB."

Analysts believe that the problems at Quebrada blanca are a major reason why Teck sought a merger between Anglo American and Teck, which would allow them to share operations with the nearby Collahuasi Mine. Anglo American said that it supported Teck's Quebrada Blanca strategy and had experience with similar tailings problems at its Quellaveco Mine in Peru.

Teck shareholders will vote on the transaction on Tuesday.

Analysts say that if the combined company fails to achieve its output targets in the next two years, it could affect the valuation of the new company.

Teck did not mention the Sernageomin Inspection, the crack, or leaks in its financial disclosures. Teck has addressed the reasons why the miner had to cut back on production and spend $420 million next year to fix certain core issues at the tailings pond.

After the collapse of the Brumadinho tailings in Brazil, which killed 270 people in 2019, safety standards for tailings are being scrutinized worldwide.

According to tailings experts, cracks and leaks are red flags that indicate a dam's stability. They require constant monitoring and the identification of its root cause.

They are similar to symptoms in the doctor's clinic. Rennie Kaunda is a professor of mining engineering at Colorado School of Mines. He said that they may be signs of a major illness or disease. (Reporting and editing by Veronica Brown, Rosalba o'Brien and Veronica Brown; Additional reporting by Fabian Cambero and Divyarajagopal from Toronto and Santiago)

(source: Reuters)