Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-), Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-). Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution There have been several to develop alternative gold extraction processs whihc could replace this one. This due to:

Metallic gold ferquently is found is aluminosilicate rocks and it is f

1.	Metallic gold ferquently is found is aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aearated sodium cyanide solution. During this process metallic gold is slowly converted to [Au(CN)_(2)]^(-), Which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recoverd form it by reacting the gold complex with zinc, whihc is converted tio [Zn(CN)_(4)]^(2-). Gold in nature is frequently alloyed with silver. which is also oxidised vy aerated sodium by aerated sodium cyanide solution There have been several to develop alternative gold extraction processs whihc could replace this one. This due to:
Answer» Sodium cyanide solutions corrode mining machinery. Sodium cyanide ESCAPES into ground water and PRODUCES HYDROGEN cyanide which is toxic. Gold obtained by this process is not pure. The amount of gold in ALUMINOSILICATE rocks is very less. ANSWER :b