** U.S.-listed shares of miner Sigma Lithium SGML.O up
5.4% at $17.72
** Co says it is increasing its proven and probable mineral
reserve balance by 40% to 77 million tonnes
** Says the increase is occurring within its phase 3 and
phase 4 mines, resulting in a lengthening of the duration of its
integrated mining to an estimated 25 years
** Adds that the rise in balances enables opportunities for
a third and potentially fourth processing facility at its Grota
do Cirilo project in Brazil
** Including the session's gains, stock is down ~44% YTD
(Reporting by Sourasis Bose in Bengaluru)
((Sourasis.bose@thomsonreuters.com))