Toxic mercury is used to dissolve and concentrate the gold. Then the mercury is boiled off with very toxic fumes to reveal the gold.

Toxic mercury is used to dissolve and concentrate the gold. Then the mercury is boiled off with very toxic fumes to reveal the gold. UNEP Image and ciopyright

Toxic mercury is used to dissolve and concentrate the gold. Then the mercury is boiled off with very toxic fumes to reveal the gold.