INVESTIGADORES
CASTRO Brigida Marta Ester
congresos y reuniones científicas
Título:
Avances en el conocimiento y exploración del depósito epitermal de oro y plata Casposo, Departamento Calingasta, provincia de San Juan
Autor/es:
SOTARELLO, GUSTAVO; BELVIDERI, IRMA; CASTRO DE MACHUCA, BRÍGIDA; FERNÁNDEZ, GUSTAVO; MACHUCA, EDUARDO; MC GUINTY, WILLIAM
Lugar:
Buenos Aires
Reunión:
Congreso; VIII Congreso Argentino de Geología Económica; 2005
Institución organizadora:
Asociación Argentina de Geólogos Economistas
Resumen:
Gold-silver mineralization at Casposo deposit is hosted within multiphase epithermal quartz±calcite±adularia veins, fault breccias and stockworks associated with tensional faulting and hydrothermal brecciation in a pyroclastic-volcanic sequence (Choiyoi Group). Mineralization is located along subvertical to steeply west-southwesterly dipping, northwest-southeast, north-south and east-west striking structures. Ore minerals include gold, native silver, electrum, acanthite, argentotetrahedrite, low silver-bearing tetrahedrite, silver sulphosalts and minor stromeyerite, iodargyrite, cervelleite and hessite, with fine-grained sulphides (mainly pyrite). Oxidation has reached depths of > 50 meters within veins and breccias. Estimated global resources (gold equivalent cut off 1.3 g/t) are 2.682.000 tons grading 4.16 g/t gold and 114 g/t silver.
