On September 6, a Brazilian judge issued an emergency injunction requiring Sigma Mining, an operating subsidiary of Sigma Lithium, to cease all extraction activities at its Grotta do Cério facility in Minas Gerais state. The ruling simultaneously revokes the project’s environmental permits, bringing a complete halt to mining and processing operations until further notice.
The legal action was initiated by a quilombola community association, which alleged that the developer misrepresented the proximity of the mine site to the traditional lands of the Bauquilombola people. The Grotta do Cério deposit sits within the region widely recognized as Brazil’s lithium corridor and features an integrated processing plant, making it a cornerstone of domestic hard-rock lithium expansion.
The sudden operational suspension introduces regulatory uncertainty into one of the world’s most significant emerging lithium hubs. Supply chain stakeholders will watch closely to see how long the judicial review process takes and whether alternative permitting pathways can restore production without prolonged disruption to global battery material flows.