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Hi everyone,
I have 200 tonnes of ore that is preg robbing. The free gold is approx 30% and the preg robbed gold approx 60%. The remaining 10% is slow leaching preg robbed and locked in either sulphides or silicates.
I had diagnostic leaching testing to confirm the above.
This ore was cleaned up from a mill where it is suspected activated carbon from the CIP circuit was milled by the ball mill. So the activated carbon has the same size distribution as the ore.
I tried roasting at 450 degrees C with sodium nitrate as an oxidising agent, however this resulted in only 30% recovery, the same as the free milling component.
Before trying more aggressive roasting conditions, I wondered if it is possible to leach the ore with acetonitrile on a large scale of the lab version.
Has anybody here had any experience with acetonitrile?
Can I use an acetonitile leach after a cyanide leach?
And is there any reason I couldn't heap leach the ore with cyanide first, followed by acetonitrile?
Thanks in advance
Adrian