the early red stuff (from my head) that whole reserve was...

the early red stuff (from my head) that whole reserve was assessed at 1.1 fe203
initially the LIMS mag seperators (low intensity magnetic separation) were designed undersized and the issue of Fe (the red) was made worse cos the WHIMS (wet high intensity magnetic separation) was not initially installed cos of supplier liquidation issues.
tbh, the downstream buyers can cope with whatever (and pay accordingly for quality) as long as the supply quality is consistent (so they do not need to fiddle with their process lines too often - that is what stuffs them about).