Ann: Minim Martap Project Update, page-95

you want high available alumina, not just high total alumina and low reactive silica because the reactive silica chews up caustic soda in its removal and can be a significant cost in producing alumina - 1% reactive silica = US$5 per tonne penalty or thereabouts

it's a bulk handling operation so operating costs are important

the grades are very good but are offset by a long truck haul, a long rail haul on a shared railway and the associated rehandling costs

improved port costs and economies of scale should be realised in the BFS