 Sigma Lithium Corp TSX-V:SGML, OTCQB:SGMLF, NASDAQ:SGML said it has begun construction on site to build the foundation and infrastructure installation of a greentech dense media separation production plant at its wholly-owned Grota do Cirilo lithium project in Brazil. The company noted that it is on track to begin production at Grota do Cirilo in the fourth quarter of 2022 and it has the funds to meet the equity funding requirements under its proposed construction debt facility. 