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Brazil closes Sigma Lithium waste heaps due to safety concerns

According to documents seen by the.

Documents show that the order is part of Sigma's ongoing efforts to restart the mine. The mine was previously Brazil's biggest lithium producer with an annual capacity of 270,000 tons of lithium concentrate. It has been inactive for the last month. The ministry and miner did not immediately respond to comments.

The firm stated in November that production would resume?in two or three weeks' time during a earnings call.

SHARES DROP AFTER DOWNGRADE Bank of America, citing a lack of certainty about when production will resume, downgraded the company's?shares last week. The shares fell 15% in one day after the Bank of America's assessment.

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

On?December 5th, labor officials made the decision to close access to the piles. They rejected the company's request to lift this order on Tuesday. Sigma's only productive asset at the Grota do Cirilo Mine, is unlikely to produce lithium without the three prohibited stacks where it stores waste after processing.

Documents show that Sigma informed inspectors of the "significant economic and operational impacts" that would result from losing access to piles, as well as jeopardizing "the continuity of mining activities".

Sigma, once the largest player in Brazil's fledgling industry for lithium, has been facing challenges since 2023. Lower lithium prices have made it difficult to expand its mining operations. The company 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 over safety at Grota do Cirilo. Sigma must present proof that it has addressed the issues identified by inspectors in order to resume the use of the prohibited waste piles.

On November 12, a labor inspector visiting the mine site reported a "partial rupture" of one of its piles near the school in Poco Dantas. He cited this as evidence that structural problems existed.

In a report dated January 6, a labor inspector dismissed Sigma's claim that the piles were safe. (Reporting and Editing by Brad Haynes and Rod Nickel.)

(source: Reuters)