my best guess is that people got spooked by the 80% recovery headline, not realising how light the acid dose was. When BAR studied this previously, they got to 99% cobalt, 98% manganese and 63% Nickelt at 200kg/t, which is 5x less acid then ARL applied in the most recent.
Most recent work done by BAR was done at even less acid, so i think we are in the chocolates here so to speak
http://www.barraresources.com.au/wp-content/uploads/2012/03/Mt-Thirsty-Metallurgical-Update.pdf
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