The other option involves Randgold who has the Tongon Gold Mine...

The other option involves Randgold who has the Tongon Gold Mine very close by, and who have been working through similar issues in similar host rocks and mineralisation styles.

YeYear on year, gold recovery improved by 6% to 82.6%
and by december 2015 had improved to 84%, mainly
aas a result of improving and sustaining both the flash
and rougher flotation concentrate mass pull, the
ultrafine grind of the concentrates and its treatment,
making it more amenable to leaching in the CIL circuit.
Gold production increased 7% year on year to
242 948oz due to higher gold recovery and mill
throughput. Further recovery gains are anticipated
through optimising the flotation and ultrafine grind
circuits to recover all the arsenopyrite associated
gold, with the overall recovery target being the original
feasibility specification of +86%.

Read more at

http://www.randgoldresources.com/si...files/RRL Annual report_Tongon Operations.pdf

Early days for AOP, but the process sheet exists and is in practice next door, so do not panic.