I might also question the residence time in the ISA mill. Its not torque thats the issue, it is energy imparted to create additional surface area.
In retrospect it is Milling 101. We delighted that the gold grade went up, but so did the particle size, hence more energy needed to be imparted per tonne of feed. Increasing feed rate at the same time as bigger particles means more energy is required per tonne and we had more tonnes to deal with as well.
Hence totally crap recoveries.
talk about duh!
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