 Kitco News - Sigma Lithium NASDAQ, TSXV: SGML yesterday reported positive economic results of its study to potentially triple integrated production of battery grade sustainable lithium concentrate from 270,000 tpa 36,700 tpa LCE commencing in 2023 to 768,000 tpa 104,200 tpa LCE in the second year at the companys 100 owned Grota do Cirilo project. 