I was recently looking at the Amursk POX (pressure oxidisation)...

I was recently looking at the Amursk POX (pressure oxidisation) hub in Russia in relation to AQG's sulphide gold project in Turkey.

The autoclaves at Amursk run at 200 degrees and 21 atmospheres of pressure and they accept a slurry made from filter cake from floatation with a grade of ~50g/t although the gold recovery process is very sensitive to the amount of sulphur in the slurry.

BBX are yet to properly explain how the gold is bound in the rock, all we know is it exists in some strange ionic form. Sulphur and sulphides don't seem to play a part. At least the Amursk example shows that sulphidic gold concentrates are being treated at grades of about 2ozs/t. Some comfort I suppose but I'm still not buying any of it based on the information provided so far. Esh