If the US miner is found to have mined too close to a large jarrah tree, it would trigger an automatic cancellation of its right to mine much of its lease.
Alcoa chief executive Bill Oplinger will look to shore up state government support for his vital WA mining that is facing public scrutiny for the first time.
The US giant pretends Labor's policies are thwarting the expansion of its Gorgon and Wheatstone gas plants, which it does not plan to do anyway, to gain leverage with governments.
