Geology
- Hierro Indio is formed by a series of mineralized bodies aligned North-South, deeping 60º to the West.
- The sedimentary units – limestones and shales – are intruded by andesitic porphyries, which generate an important metasomatic iron system when in contact with the wall rock.
- The shape and the size of the bodies are irregular.
- The iron ore is formed by magnetite (Fe3O4) and subordinated oligist (Fe2 O3).
- Supergene mineralization is constituted by hematite and limonites.
Background
- XIX Century First Mentions of Iron Ore in the Project Area.
- 1937- 1938 First Mining Concessions.
- 1938-1939 Geological Exploration. (National Mining Directorate)
- 1949- 1972 Production of 30 to 60 T/Day (Encinas).
- 1954 Geological Exploration (D.G.F.M.).
- 1981- 1982 Geological Exploration, Geophysics and exploratory drilling (D.G.F.M. and D.P.M.).
- 2004- 2005 Production of 30 T/Day (Private).
