On Friday, the majority of U.S.-listed lithium mining concept stocks experienced gains. At the time of writing, Sigma Lithium (SGML.US) surged more than 15%, Sociedad Química y Minera de Chile (SQM.US) rose over 1%, and Lithium Americas (LAC.US) saw a slight increase.

Catalyzing the movement, Sigma Lithium announced it had sold an additional 100,000 metric tons of high-purity lithium concentrate. Concurrently, the restart of its mine is progressing according to schedule and is expected to be completed within the month.

The company stated that the sold lithium concentrate came from its inventory at the Port of Vitória in Brazil. The transaction price was determined using a market-based pricing mechanism benchmarked against the Shanghai Metals Market (SMM) index.

On an adjusted basis, the sales price equates to a final net price of $140 per metric ton for concentrate containing 1% lithium oxide.

Operationally, Sigma Lithium also strongly refuted recent media reports claiming it was subject to an "operational ban." Previous reports had suggested the company was "ordered to suspend operations" by Brazil's Ministry of Labor and Employment.

Sigma Lithium clarified that the related reports misrepresented the nature of a routine administrative procedure by the Ministry. The company emphasized it has not been shut down, and such claims are inconsistent with the facts.

The company stressed that the mine restart progress aligns with the established plan, and both sales and operational activities continue to advance normally.