remember miners have usually gotten an average of $5/ton extra for each % over benchmark of 62%-(a new higher benchmark may affect this some) of outcroppings tested at 67%,they are mining the veins -would be many years before they got down to the lower % beneficiation type ore -and the posted official lab results for one ship were 64.5%-

they also have the separator which can raise ore by 3-7% -so if they had 64.5% ore that would be spot of 130 (if they are using current spot rather than spot at time trucked or an average) plus 12.50/ton or 142.50 (based on past actual postings for different companies) minus any discount of spot price -which is why I've said before any premium ore would likely take care of or cancel the effect of any discount