That's because PLA's ore is twice as rich as Aquarius' ore and up to 10x as rich as Ridge's ore. Aquarius is down 5% today on news they are taking over Ridge (to save it). Bad idea! Heaps of debt! Must be a reason why Anglo wants out of the JV with Ridge too? Crappy ore I reckon. Time for Aquarius holders to move across to PLA before Aquarius goes the same way as OZL.