Mining giant Rio Tinto announced today an agreement to acquire Philadelphia-based lithium chemicals producer Arcadium Lithium, in a transaction described by Rio Tinto as aimed at “establishing a global leader in energy transition commodities.” Tinto will pay $6.7 billion for the company in the all-cash transaction, paying shareholders $5.85 per share, a 90% premium over Arcadium’s October 4, 2024 closing…