Alcoa Corp.(NYSE:AA), a leading U.S. aluminum producer, has made a $2.2 billion offer to acquire Alumina Ltd (OTCQX:AWCMF), its Alcoa World Alumina & Chemicals (AWAC) joint-venture partner.

Alcoa (NYSE: AA) announced Tuesday it had signed a memorandum of understanding over the continuing aluminum-smelting operation of its San Ciprián, Spain, facility. The MOU, with IGNIS Equity ...