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"GCY is oxide ore with recovery at approx 96% therefore much lower AISC. "

Think if you read the resource statement most of GCY's ore is sulphide (fresh ore ) . up to now they would have been mainly mining oxide ore but that will be changing now as they concentrate on the big pit , where most of the oxide ore would have been previously mined apart from what will be in the cut backs .

Be interesting to see how the recoveries go with the sulphide ore my guess is they will be ok