Los Congos Mine, Atos Pampa, Calamuchita Department, Córdoba, Argentina

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Elevation: 1030 m. above sea level.
"Los Congos" and "El Cromo" mines: at bands of ultramafic and mafic serpentinized and/or amphibolitized housed in a metamorphic sequence rocks. The mineral is disseminated or in concentrations of up to 85% with less than 5 mm grain size; in deposits podiformes, IARC and mineralized belts along with magnetite, ilmenite, titaniferous magnetite, rich spinels in Al, Fe and Mg, hematite, chromomagnetite and Ni-Fe - minority proportions Cu sulfides. The zonalidad is common. Studied by optical and electronic microprobe.

"Los Congos" Mine:
It has been described to the Strip Western ultramafic in the Sierras of Córdoba as bodies of serpentinite have is elongated in the foliation with a maximum length of 1300 to 1700 m for a width of 700 to 800 m in the "Los Congos" outcrop that is larger. The main rock is made up of a medium to coarse-grain harzburgite, composed of enstatite, brown glass elongated in sense of the general foliation, with minor structures location folded in crystals of axial plane coincides with the primary foliation S2 = S3, immersed in a matrix serpentine dark coloration afanitic. They are in addition to the harzburgitic variety, a rock consisting of a colour altered serpentinite medium gray to dark, with greenish tones that can be thin bands of chromite and magnetite, that in some cases are scattered.
Chemical Analysis of Chromite(Fe2+Cr2O4), mineralization core:
Al2O3: 21.8 - 29.9%
Fe2O3: 9.7 - 10.6%
Cr2O3: 31.1 - 32.7%
MnO: 0.4%
FeO: 11.0 - 12.1%

Ilmenite:
Was presented in the Ultramafic Complex. Chemical Analysis by electronic microprobe:
TiO2: 53.32%.
Al2O3: 0.02%.
Fe2O3: 4.10%.
FeO: 38.14%.
Cr2O3: 0.01%.
MnO: 0.63%.
MgO: 4.81%.

Mineral List

Chromite Hematite

Ilmenite Magnetite

'Serpentine Group' Spinel

6 entries listed. 5 valid minerals.

References