Announcement • Jun 10
Sigma Lithium Corporation Wins in State Court of Minas Gerais and Announces Overturn of Unwarranted Local Judge Decision Sigma Lithium Corporation announces that a Court of Appeal Judge in the the Court of Justice of Minas Gerais state (“Court of Justice”) overturned a local lower court decision that included the potential for a legal collateral of USD 10 million, as detailed in the Company’s announcement of May 18, 2026. The Court of Justice asked the Company to fund the engagement of an independent technical advisory firm to monitor the impacts of Sigma Lithium operations on the residents of the local municipalities of Araçuaí and Itinga. The Company welcomed the requirement of the impact assessment study as an excellent opportunity to establish the facts of the matter through an independent evaluation. Sigma Lithium’s legal counsel highlighted the discrepancy between the data presented by the prosecution and the evidence submitted by the Company in its defense. On June 2, Sigma Lithium publicly disclosed 12 months of environmental monitoring data, independently collected and verified by external experts through May 2026, demonstrating the Company’s environmental performance and track record: low levels of dust, vibrations, noise, monitored in four neighbouring communities. Dust: Sigma Lithium operates 560% better than recommended standards for total suspended particles, 350% better for particles of below 2.5 micrometers. Noise: 95 measurement campaigns conducted during night and day demonstrated compliance with Brazilian established standards. Vibrations: The level of vibrations measured in terms of velocity measured in millimeters per second against the frequency measured in Hertz was extremely low, barely registering on the seismograph scale, when set against the recommended limits. SGML
Live News • Jun 10
Sigma Lithium Prevails in Minas Gerais Court Backed by Third-Party Environmental Data Sigma Lithium won a ruling from the Court of Justice of Minas Gerais, which reversed a lower court decision that had put a US$10 million legal collateral at risk.
The decision relied on one year of environmental monitoring by independent experts, showing low levels of dust, noise and vibrations in four neighboring communities.
The court’s conclusion underlines the company’s use of transparent, third-party environmental data in defending its mining operations and sustainability practices.
This ruling reduces immediate legal and financial pressure related to the contested collateral and indicates that the company’s environmental monitoring framework held up under judicial scrutiny.
Investors should still watch for any future legal or community challenges around environmental issues, since these can affect operating continuity and project timelines even when a company secures a favorable court decision. Announcement • Jun 03
Sigma Lithium Files One Year of External Expert Environmental Data Demonstrating Low Levels of Dust, Vibrations, and Noise Sigma Lithium filed one year of external expert environmental data (for the 12 months to May 2026) demonstrating its track record: low levels of dust, vibrations, noise, monitored in four neighbouring communities. Dust: Sigma Lithium operates 560% better than recommended standards for total suspended particles, 350% better for particle size of below 2.5 micrometers. Noise: 95 measurement campaigns conducted during night and day demonstrated compliance with ABNT standards. Vibrations: The level of vibrations measured in terms of velocity measured in millimeters per second against the frequency measured in Hertz were extremely low, barely registering on the seismograph scale, when set against the ABNT limits. The data series externally collected by experts provides transparent, objective evidence of Sigma Lithium's environmental track record. The evidence filed directly refutes baseless and unproven claims against the Company made in local Brazilian courts, currently under appeal at the State Courts in Minas Gerais (Tribunal de Justiça de Minas Gerais). The data points are below the stringent legal limits in Brazil, as well as the established standards of the Brazilian Technical Standards Association ("Associacao Brasileira de Normas Tecnicas" or "ABNT") and Brazil's National Environmental Council ("Conselho Nacional do Meio Ambiente" or "CONAMA"). Tables 1, 2, and 3 show data with respect to the monitoring of dust. Data is presented for the twelve months to May 2026 showing total suspended particles and particle size below 10 and 2.5 micrometers measured in four locations in the community (C1, C2, C3, and C4). The data shows that the levels of dust generated by Sigma Lithium's operations were 350% to 560% below the CONAMA standard limits established for each category. Table 4 shows the level of vibration measured in the twelve months to May 2026 in terms of velocity measured in millimeters per second against the frequency measured in Hertz. The vibrations (marked by "X" in the chart) are extremely low, when set against the ABNT limits shown in the red line. Table 5 shows the results of noise monitoring in the twelve months to May 2026 that measures compliance with ABTN limits in terms of decibels at four locations. The chart includes a data set for daytime monitoring and another for nighttime monitoring.