Sigma Lithium Stock Down 14% Amid Operational Challenges and Downgrade

Shares of Sigma Lithium are falling 12.9% after being downgraded to hold from buy and encountering challenges in restarting operations at its Brazilian mine. The Labor Ministry has also shut down three waste piles at the Grota do Cirilo asset, citing a "grave and imminent" risk to workers and community members. Investors are removing Sigma Lithium from their portfolios due to the uncertainty surrounding the start-up of operations at Grota do Cirilo.