Shares of **Sigma Lithium Corporation** (SGML) tumbled sharply on Tuesday after a Brazilian court reportedly ordered the suspension of environmental licenses and mining operations at the company’s sole producing site, the Grota do Cirilo complex in Minas Gerais. The stock, one of the few Brazilian companies with a direct listing on the US market, fell 11.26% to $11.00 on the NASDAQ, following news of the ruling late last week.