Gold is extracted by hydrometallurgical process, based on its property

1) of being electropositive

2) of being less reactive

3) to form complexes which are water soluble

4) to form salts which are water soluble  

Based on the solubility rules, the following salts are water-soluble EXCEPT

Copper can be obtained from copper pyrites by some suitable process. Some metallurgical processes are given below

(i) Roasting

(ii) Leaching

(iii) Froth floatation process

(iv) Self reduction

(v) Poling

(vi) Chromatography

(vii) Hall Heroult process

The method which is not used in extraction of copper from copper pyrite