Question

how is Ag or Au obtained by leaching from the respective ores??

Answer 1

Answer:

The Au—Ag alloy—the doré alloy—is cast into anodes and subjected to known-per-se operations of electrochemical and thermal refining, in order to obtain pure gold and silver. The slag obtained by smelting cementum is ground and recycled to the leaching operation of the raw material.

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Answer 2

Leaching is often used if the ore is soluble in some suitable solvent. In the metallurgy of silver and gold, the respective metal is leached with a dilute solution of NaCN or KCN in the presence of air, which supplies O2. The metal is obtained later by replacement reaction.