 Different zones can be identified at different depths.From the surface down they are gossan cap, leached zone, oxidized zone, water table, enriched zone (supergene enriched zone) and primary zone (hypogene zone).Pyrite FeS2 is generally abundant, and near the surface it oxidises to insoluble compounds such as goethite FeO(OH) and limonite, forming a porous covering to the oxidized zone known as gossan or iron hat.