A letter from the US miner raised hope that the jarrah forest inland from Perth would escape its strip mining for bauxite, but Alcoa is keeping its options open.
Adbri, formerly Adelaide Brighton, is an Adelaide-based cement and lime company that operates a large lime plant in suburban Perth under its Cockburn Cement brand.
Most big WA carbon polluters including Chevron, Adbri, South32 and Woodside are wanting on emissions reduction targets, strategy and cash, according to benchmarking for the world's biggest investors.
No deal with Alcoa has cost Adelaide Brighton 31% of its value and threatened its WA lime business that is warring with its neighbours in suburban Perth.
