I have concentrate - help!

[sayno]

Hi~
I have concentrate.(about 2 lbs. but huge weight possible)
This which is from Korean gold mine contains a great deal of gold-weight.
This contains a great deal of iron sulfide and clay.
But, doesn't contain AS,CU,ZN.
Please tell me the way to extract gold and silver from this dust.

 

[Brandt]

try using ammonium thiosulfate with ammonia an copper chloride

 

[leavemealone]

Yes that or sodium thiosulfate.Filter well and electrowin or zinc to precipitate.If theres a lot of silver,then treat the percipitant with nitric.
Johnny