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La Mendocina Mine, Bonillas Cord, Uspallata, Las Heras Department, Mendoza, Argentina
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Latitude: 32°38'9"S
Longitude: 69°11'34"W
 
Name(s) in local language(s): Mina "La Mendocina", Cordón de Bonillas, Uspallata, Departamento Las Heras, Provincia de Mendoza, Argentina.
 
Elevation: 2,892 m. above sea level.
Talc Deposit, located at 18 Km. to SE of Uspallata City.
"La Mendocina" mine consists of bodies or streaks of talc housed in lenticular bodies of serpentinite with general direction North-South, tilt 35 ° to 45 ° E and power between 1.4 and 2 metres. The thickness of the deposits range between 1 and 2 meters, in some cases, reaching 6 metres. In depth mineralization has been recognized more than 70 meters, as it is the case of this mine.
Genetic model: the formation of deposits of the talc is related to the alteration of the ultra basic bodies in three stages. The first occurs the serpentinization of the rocks, in the second the resulting serpentinite is carbonatized by the action of fluids carrying CO2 and the formation of the talc-carbonate Association. The last stage, with the contribution of SiO2 and H2O solutions produced the esteatization of the previous rocks with the extraction of Fe, Al and Mg.
Operating system: virtually all the deposits have been exploited opencast and shallow. In those cases that have had make shafts, tunnels, galleries, these have not passed 20 meters and reached exceptionally 60 m, such is the case of the mine "La Mendocina", where the galleries made exceeded the 400 meters in length.
Chemical analysis on two samples of Talc:
SiO2: 59.12 % - 61.22%.
CaO: 1.32% - 0.73%.
MgO: 32.88% - 30.46%.
Fe2O3: 0.60% - 0.73%.

Mineral List

Actinolite
Albite
Amphibole Supergroup
Antigorite
'Asbestos'
Calcite
'Chlorite Group'
Chrysotile
Dolomite
'Limonite'
Pyrite
Quartz
'Serpentine Group'
Talc
Tremolite


15 entries listed. 11 valid minerals.

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References

J. A. Fallet y E. Zanoni (1999). Yacimientos de Talco en Mendoza. En: Recursos Minerales de la República Argentina (1999).(Edición E. O. Zappettini). Instituto de Geología y Recursos Minerales. SEGEMAR, Volumen I, Anales Nº 35; 715-720. Buenos Aires.

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