copper +silver+tin +pb+pd+au---being 90% and 10% of the rest

[arthur kierski]

i have done a cianide leaching of this material and got a lot of copper;does copper comes out in great quantities in cyanide leaching-? i have done (i think the right think)----after leached, to the filtrate naoh was added to ph 14 and zinc (4 times estimated gold) was added - after another filtration the zinc was dissolved with h2so4 and i was left with a brown powder containing the gold and a lot of copper

 

[Platdigger]

This is not really in answer to your question Arthur, but more of a question to like Chris or Harold.

Isn't the trick to making cyanide more "selective" for gold, to run it very dilute?
Randy

 

[Harold_V]

This is not really in answer to your question Arthur, but more of a question to like Chris or Harold.

Isn't the trick to making cyanide more "selective" for gold, to run it very dilute?
Randy

That's correct. If it it held in the vicinity of .02%, it is supposed to ignore copper.

Harold

 

[arthur kierski]

i am going to check the concentration of the cianide leach solution which i bought in a chemical store here in brazil--thanks platdigger and harold for folowing this case---