Eramet SA $ERA.PA experienced a sharp decline in its share price, tumbling as much as 5.7%, after Gabon announced a plan to halt exports of manganese ore starting in 2029. This policy change raises critical concerns for the Paris-listed miner, given that Gabon represents its primary source of profitability. Friday’s declaration signals a turning point for the global manganese market, particularly for companies reliant on Gabonese supply streams.