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Sigma Lithium Corporation files foreign issuer current reports that document operating and commercial updates for its lithium concentrate business. Its Form 6-K disclosures include earnings materials, production guidance, sales of high-grade lithium oxide concentrate and high-purity lithium fines, offtake agreements, and working-capital financing supported by bank guarantees or customer-backed arrangements.
The filing record also describes the Grota do Cirilo operation, the Greentech Industrial Plant, capacity-expansion disclosures, and sustainability-related operating practices such as dry stacking, water reuse, avoiding toxic chemicals, and renewable power. These disclosures connect reported financial results, commercial contracts, capital resources, and mine operations to the company's Brazilian lithium production platform.
Sigma Lithium Corporation is notifying investors that it will release its fourth quarter 2025 earnings results before the market opens on Monday, March 30, 2026. The company will host a webcast conference call the same day at 8:30 a.m. EST to discuss the results.
Sigma Lithium operates the Grota do Cirilo lithium project in Brazil and describes itself as a leading global producer focused on socially and environmentally sustainable lithium oxide concentrate. It currently has nameplate capacity to produce 270,000 tonnes of lithium oxide concentrate annually and has started building a second plant to increase capacity to 520,000 tonnes.
Sigma Lithium Corporation issued 12‑month production and cost guidance for its Grota do Cirilo operation and outlined longer‑term targets ahead of a presentation at the 2026 BMO Global Metals, Mining & Critical Minerals Conference.
The company targets lithium oxide concentrate production of 220,000 tonnes for the coming 12‑month run‑rate period from Phase 1, rising to 270,000 tonnes and then 520,000 tonnes for estimated FY2027E with Phases 1 and 2. All‑in sustaining cost is guided at US$599 per tonne for Phase 1 and US$511 per tonne at full 520,000‑tonne capacity, based on a CIF China cash cost of US$440 per tonne. At realized lithium prices of US$1,000, US$1,400 and US$1,800 per tonne, the company forecasts annual cash flow of US$78 million, US$156 million and US$233 million for Phase 1, and up to US$225 million, US$408 million and US$592 million respectively at 520,000 tonnes.
Sigma Lithium reported two key commercial developments. The company sold 150,000 tonnes of low-grade lithium fines at a net final price of US$140/t, and granted the buyer an option to purchase an additional 350,000 tonnes at market prices upon delivery at the Port of Vitoria.
The company highlighted that successful sales of this Low Grade Product can generate proceeds equivalent to selling 70,000 tonnes of its High Grade Lithium Concentrate. Sigma Lithium also activated a production-backed revolving prepayment facility of US$96 million, tied to supplying 70,500 tonnes of High Grade Lithium Concentrate during 2026.
Under this revolver, fixed prepayment installments of US$8 million are made 30 days before production and delivery, bearing interest of SOFR plus 1% for 30 days. Sales prices are set to match prevailing spot market prices, preserving exposure to lithium price upside while supporting near-term liquidity.
Sigma Lithium reports that Brazil’s National Mining Agency has issued an official technical statement affirming the safety of the company’s waste piles. After drone and on-site inspections on January 20, the regulator found no geotechnical anomalies and no legal basis for precautionary closure measures.
The company reiterates that a separate administrative enquiry by the Ministry of Labor and Employment is not considered material to its ability to continue mining operations. Management says market volatility and confusion around its waste and tailings piles stem from disinformation, including phishing using fake government domains, and notes it is engaging with authorities such as FINRA.
Sigma Lithium explains that its “waste piles” are mainly hard schist rock from mining, distinct from dry-stacked lithium fines generated by its Greentech Industrial Plant, which it can sell and reinvest, and highlights its focus on environmentally sustainable lithium production at the Grota do Cirilo operation in Brazil.
Sigma Lithium has resumed mining at Mine 1 in Brazil as scheduled, with over 600 people working on site and a restructured, larger off-road equipment fleet designed to match its Greentech Industrial Plant capacity.
The company highlights Fines sales, where applying US$140/t to 950,000t of inventory could generate cash flow comparable to selling about 70,000t of high‑grade concentrate at US$1,800/t. Guidance scenarios show Phase 1 production of 220,000–270,000t in FY2026E and 520,000t for Phases 1 & 2 in FY2027E, with all‑in sustaining costs of US$599/t for Phase 1 and US$511/t for combined production, and illustrative cash flow ranging from $78M to $592M depending on realized lithium prices.
Sigma Lithium has resumed mining at Mine 1 in Brazil as scheduled, with over 600 people working on site and a restructured, larger off-road equipment fleet designed to match its Greentech Industrial Plant capacity.
The company highlights Fines sales, where applying US$140/t to 950,000t of inventory could generate cash flow comparable to selling about 70,000t of high‑grade concentrate at US$1,800/t. Guidance scenarios show Phase 1 production of 220,000–270,000t in FY2026E and 520,000t for Phases 1 & 2 in FY2027E, with all‑in sustaining costs of US$599/t for Phase 1 and US$511/t for combined production, and illustrative cash flow ranging from $78M to $592M depending on realized lithium prices.
Sigma Lithium Corporation reported that it has sold an additional 100,000 tonnes of high purity lithium fines stored at the Port of Vitoria, priced at market levels referenced to the Shanghai Metals Market index, with an adjusted net final price of US$140 per tonne for 1% lithium oxide content.
The company reiterates that remobilization of its mining contractor, including equipment and personnel at its Brazilian mine, is proceeding as planned and is expected to conclude in January 2026, with operations continuing. Sigma Lithium notes that a mid-December administrative enquiry by Brazil’s Ministry of Labor and Employment into its waste piles, following a routine health and safety inspection, does not affect its ability to operate and was not considered material by management.
The company highlights its Greentech plant’s environmental features, including dry-stacked tailings, full water reuse, no toxic processing chemicals and 100% renewable power, and reminds investors it has nameplate capacity of 270,000 tonnes of lithium oxide concentrate annually at its Grota do Cirilo operation in Brazil and is building a second plant to double capacity.
Sigma Lithium reports several operational and governance updates. The company completed its first sale of 100,000 tonnes of high purity lithium fines stored at the Port of Vitoria, at market prices linked to the Shanghai Metals Market index, generating net revenues of approximately USD 11 million. It also has an additional 850,000 tonnes of high-purity lithium fines available for sale at its plant.
The company is advancing a remobilization plan at Mine 1 after restructuring mining operations in late 2025, combining company-led technical control with subcontracted execution and newly leased large-scale equipment that is expected to almost triple prior mining and earth-moving capacity. Sigma Lithium signed a working capital agreement with a major client tied to monthly sales totaling 70,500 tonnes by the end of 2026, with a first tranche of USD 5 million closed. The board appointed former Brazilian Minister of Agriculture Katia Abreu as an independent director, replacing Eugenio de Zagottis, while maintaining a majority-independent board and 40% female representation.