Iron oxide copper gold ore deposits to be within Neoproterozoic to Mesoproterozoic basement. Worldwide, ages of recognised IOCG deposits range from 1.8 Ga to 15 Ma, however, the majority are within the 1.6 Ga to 850 Ma range. Ore minerals in IOCG deposits are typically copper-iron sulfide chalcopyrite and gangue pyrite, forming 10–15% of the rock mass. Supergene profiles can be developed above weathered examples of IOCG deposits, as exemplified by the Sossego deposit, Para State, Brazil, where typical oxidised copper minerals are present, e.g.; malachite, cuprite, native copper and minor amounts of digenite and chalcocite. Alteration is a mixture of sodic-calcic (albite-epidote) to potassic (K-feldspar)
Ore Mountain Basin Ore Mountain Basin The Ore Mountain Basin or Erzgebirge Basin () is a natural region in the German federal state of Saxony, that is part of the Saxon Lowland. To the north it borders on the Mulde Loess Hills and to the south on several natural regions in the Saxon Highlands and Uplands. The basin is a structural depression running from northeast to southwest in the Ore Mountain peneplain that is filled with Devonian and Carboniferous sediments. The main communications from the Ore Mountains follow the valleys downhill and are collected by a major routeway to the north that follows