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Brazil closes Sigma Lithium waste heaps due to safety concerns

According to documents obtained by the.

Sigma continues to struggle to restart Brazil's largest lithium mine with a capacity of 270,000 tons of lithium concentrate per year. The documents indicate that it has not been active since October.

Sigma said in a press release that the restrictions would not impact its ability to continue operations or affect its timeline for restarting production. The miner said that there were no safety risks, and the piles contained only soil.

In a statement the ministry stated that the piles are still a concern despite the closure. It added that an erupted waste pile could spill over nearby homes or into the Piaui River.

SHARES DROP AFTER DOWNGRADE

In November, during a conference call to discuss earnings, the company said that production would resume in the mine within two or three weeks. Bank of America downgraded shares of the company last week, when the mine was still 'non-operational'. They cited a lack of clarity about the date of production. Their assessment sent shares plummeting 15% in just one day.

The Toronto-listed company announced on Tuesday that it is advancing with its plan to restart production.

On December 5, the Labor Department issued a decision that the piles would be closed to access. They rejected the appeal of the company on Tuesday.

Sigma is unsure if it could produce lithium in the Grota do Cirilo, its sole productive asset, if the miner did not use the three prohibited heaps where they stack waste after processing.

Documents show that Sigma informed inspectors of the "significant economic and operational impacts" of losing access to the piles, as well as the risk to the continuation of mining activities.

INDUSTRY LEADER NOW IN TROUBLE

Sigma, once the largest player in Brazil's fledgling industry for lithium, has been struggling with lower lithium prices since 2023 and difficulties expanding its mining operations. Sigma has also had a tiff with Calvyn Gardner's ex-husband, the current CEO Ana Cabral. Gardner has filed a lawsuit against the company for mining rights, and expressed concerns about safety in Grota do Cirilo.

According to a Labor Ministry report, Sigma must present documentation proving that it has corrected the issues identified by inspectors before they can resume using the prohibited waste piles.

On November 12, a labor inspector visiting the mine site reported a "partial fracture" of one of a piles near an?academy in the small village of Poco Dantas. He cited this as evidence of structural problems.

In a report dated January 6, a labor inspector dismissed Sigma's claim that the piles were safe.

Sigma has confirmed that the piles meet the safety standards established by the authorities. It is showing this to the Ministry. (Reporting and editing by Brad Haynes, Rod Nickel and Fabio Teixeira)

(source: Reuters)