Brazil mining regulator halts part of Sigma Lithium's Grota do Cirilo mine over 'imminent risk'

Brazil's National Mining Agency (ANM) ordered Sigma Lithium to suspend mining in part of its Grota do Cirilo lithium mine in Minas Gerais due to an unspecified 'imminent risk' and a 'broken section' on the east slope of the north pit. The order requires immediate remediation work. The halt could disrupt lithium supply from a key producer, though the scale and duration of the suspension remain unclear.