Sigma Lithium Q3 2026: How a Court Shutdown Wiped Out the Quarter
As seen on the 24/7 Wall St. homepage on November 13, 2026.
Court-ordered shutdowns kept the Grota do Cirilo mine idle for roughly 60% of the quarter, collapsing sales volumes 68.5% and blowing a hole in both lines versus consensus. Licenses were upheld on appeal in early October and operations have restarted, with management guiding to 330,000 tonnes in 2027 at an AISC of $620 per tonne.
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Sigma Lithium's Grota do Cirilo mine in Minas Gerais, Brazil sat idle for roughly 60% of the third quarter of 2026, first under a regulatory suspension tied to a Conduct Adjustment Agreement negotiation and then under a late-September federal injunction. The result was a 68.5% collapse in sales volumes that made the headline numbers almost unrecognizable against what analysts had expected.
Revenue came in at $13.52 million, missing the consensus estimate and falling below the year-ago result, while the company reported a GAAP loss per share against an estimated profit. Embedded in that loss were idle-capacity charges at the Cleantech Industrial Plant, including depreciation and depletion that accrued even while the mine stood still, plus TAC-related fines.
The legal overhang lifted in early October when a Federal Court of Appeals upheld Sigma's environmental licenses. By November 10, the company had already produced 11,000 tonnes of high-grade concentrate since restarting, and it holds 15,000 tonnes of high-purity lithium fines plus 6,000 tonnes of intermediate products it expects to convert and sell in the fourth quarter.
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Looking further out, management is guiding to 330,000 tonnes of production in 2027 from Cleantech Industrial Plant 1 at an all-in sustaining cost of $620 per tonne. A $125 million convertible bond offering is set to reduce short-term debt by roughly 85%, and Plant 2 construction is slated to resume in 2027, targeting 580,000 tonnes per year of capacity.
The quarter's distortions make year-over-year comparisons almost meaningless as a signal of underlying business health. What investors are likely watching now is the pace at which volumes recover in Q4 2026 and whether the regulatory environment in Brazil remains stable enough for the 2027 production ramp to proceed on schedule. The company also flagged material weaknesses in internal controls over financial reporting, with a target to remediate those by the end of fiscal 2027.
Mentioned: SGML