brm, page-56

i think potential refers to the tonnage as opposed to the marketability, but i see your point : Project has the potential to produce in excess of 550 million tonnes of marketable product grading 57.5 – 59.5% Fe (DSO plus beneficiated ore).

elsewhere: Based on this testwork, the Marillana Project has the potential to produce a shipping inventory (DSO plus beneficiated mineralisation) of greater than 550Mt grading +59% Fe (weighted average).

Comes down to interpretation and the character of the md i suppose, comments?