Sigma Lithium Begins Green Lithium Production Sigma Lithium Corporation (NASDAQ:SGML) has successfully transitioned from a developer to a producer with the commencement of battery-grade sustainable lithium concentrate, also known as Green Lithium, production at its Grota do Cirilo project in Brazil. The company has achieved… Read More »Sigma Lithium Achieves Milestone with First Green Lithium Production at Grota do Cirilo Mine