Mina Martha, yacimiento argentífero Bacon. Macizo del Deseado, Provincia de Santa Cruz.

GONZÁLEZ GUILLOT, M.; DE BARRIO, R.; GANEM, F.

Río Cuarto

Congreso; Congreso de Mineralogía y Metalogenia; 2004

Martha mine, located in Bacon area, consist ofepithermal breccias with multiple brecciation stages, vein filling and mineralisation. Mineralogy and a high Ag/Au (900-1000:1) are typical from gold and silver bearing epithermal deposits ofintermediate sulfidation type.Mineralisation is essentially argentiferous .and include mainly pyrargyrite, miargyrite,freibergite, native silver and minor argentite, polybasite (and/or stephanite) and chlorargyrite.Mineralisation is related to several pulses which represents changes in the fluid physicochemicalconditions. Many of the products of these changes are overprinted due possibly to faultreactivations, lifting and increase in permeability with a shifting to conditions of minor temperature.Subsequent erosion would be responsible for exposure of deep levels of the system.