These guys didnt do the correct testwork at the start.
The process didnt work!
It had too much Arsenic in it! This shouldn't have been a shock. Weathered ore is a problem to deal with, but it is a known problem, ( not an unknown , unknown as they may like to portray)
Surely this could have been determined by a bulk scale run, before wasting $m's of hard earned holders money b4 they built the plant.