Ann: Annual Report to shareholders, page-7

Grade isn't much higher than LD, RWD in their PFS reckon they need 4772Ha for 407Ktpa.
I don't think SO4 are planning to wet harvest.
The DFS states 782Ha.
APC with grade of just over 50% of SO4 reckon they need 1200Ha total for around 100Ktpa of native harvest salts (150Ktpa after MOP conversion).
Obviously there will be different recovery assumptions across companies but SO4 does look light on pond acreage. Time will tell.