Where did they get "50% Olaroz will be battery grade"? Stage 2 is bigger than Stage 1, and none of it will be battery grade!
From the ORE website:
The only way to get to > 50% is to exclude the 10,000 tonnes from Stage 2 going to Naraha. Not to mention that the Stage 1 plant has never even managed to reach close to the 17,500 nameplate capacity of any grade, let alone battery grade from its purification circuit.
