 Sigma Lithium Corp TSX-V:SGML, OTCQB:SGMLF, NASDAQ:SGML told investors that the net present value NPV of Phase 1 of its flagship Grota do Cirilo lithium project in Brazil has increased to US1.6 billion following an updated feasibility study FS. The lithium company said the updated FS economics also demonstrate that Phase 1 of the project is financially robust even as a standalone project. 