Classifications of gold-bearing materials

    According to their mineralogical and historical characteristics the gold- bearing material can be classified as:

    • Placers.
    • Free milling ores.
    • Oxidized ores.
    • Silver-rich ores.
    • Iron sulphides.
    • Arsenic sulphides.
    • Copper sulphides.
    • Antimony sulphides.
    • Tellurides.
    • Carbonaceous.

    Each of these classes of gold bearing materials has especial mineralogical characteristics which affect their processing and are considered in the next sections.