Sigma Lithium Recognized as Sustainability and Cleantech Pioneer at UN-Climate Week in NY Featuring Lithium Oxide Industrialization; Continues to Operate Following Brazil's Democratic Rule of Law

Sigma Lithium Corporation (SGML) issued a statement addressing ongoing legal and operational matters at its Grota do Cirilo mine, asserting that mining and industrial operations continue normally and that mining rights and concession ownership remain unaffected by any ongoing legal reviews. The company categorically denied media reports suggesting its environmental licenses are suspended, stating that an administrative act published by FEAM, the Minas Gerais state environmental executive, holds no legal validity because the matter is currently before the Brazilian Federal Judiciary. Sigma Lithium characterized a new filing from the regional District Attorneys' office (MP-MG) as another request submitted for the review of the State Judiciary, noting there is no definitive decision.

The release reiterated the mine’s production capacity, citing a nameplate capacity of 330,000 tonnes of lithium oxide concentrate annually, with Phase 2 expansion targeting 580,000 tonnes and Phase 3 targeting 830,000 tonnes. The statement also included ESG-related content tied to UN-Climate Week and a Nasdaq bell-ringing event, referencing a "Quintuple Zero" initiative and social-license figures of 19,000 jobs and 80,000 family members. It further noted the company’s market capitalization has increased fivefold since its listing.

The disclosure provided no new production tonnes, sales volumes, realized prices, AISC, cash flow, balance sheet items, or drilling or reserve data. All material information contained in the release had previously been disclosed on 7 September 2026 and 16 September 2026. This marks the third iteration of the same legal-defense message issued within three weeks.

Sigma Lithium Corporation (SGML) issued a re-publication of its legal positions and ESG commentary from September 7 and 16, containing no new financial, operating, or technical content. The company asserts that an administrative act regarding environmental licenses is invalid, though the matter remains sub judice.

The stock had already reacted to earlier reports regarding the licenses, falling from US$17.10 on September 4 to US$14.30 on September 8, a decline of 16%. The share price is currently US$13.45.

The only incremental disclosure in the release is the MP-MG filing, which the company characterizes as a request with no decision rendered.

Sigma Lithium Corporation (SGML) is a producing lithium miner listed on the Nasdaq, ASX (SAU, since 3 September 2026), TSXV, and BVMF (S2GM34). The company operates the Grota do Cirilo industrial-mineral lithium complex in the Vale do Jequitinhonha, Minas Gerais, Brazil, which it describes as the fifth-largest industrial-mineral lithium oxide complex globally and the largest producer of industrial-mineral lithium oxide concentrate in the Americas.

The company produces high-grade premium lithium oxide concentrate (approximately 5% Li2O, SC5 basis) and high-purity low-grade lithium fines and middlings reprocessed from dry-stacked tailings. Its processing operations include one operating Cleantech ("Greentech") Industrial Plant with a nameplate capacity stated in this release at 330,000 tonnes per year annualised, restated up from 270,000 tonnes used consistently in company releases from January through August 2026. Phase 2 is planned to take capacity to 580,000 tonnes (previously stated as 520,000 tonnes) and Phase 3 to 830,000 tonnes (previously 770,000 tonnes).

Sigma Lithium claims its operations utilize dry-stacked tailings with zero tailings dams, 100% process water reuse, zero toxic chemicals, 100% renewable electricity, and over 1,100 days without a lost-time injury. These claims were independently supported in the 2 June 2026 filing regarding third-party dust, noise, and vibration monitoring, and the 9 June 2026 appellate ruling that overturned a US$10 million collateral requirement.