Pb-Zn-Ag mining district (most important deposit is the Rara Fortuna). Hydrothermal veins filling fractures in Precambrian metamorphic rocks of the Sierras Pampeanas.
Ref.:
Sureda, R. J. (1978): Veins of lead, silver and zinc of the "El Guaico" metal mining district in the province of Cordoba, Republic of Argentina. Asoc. Geol. Argent. Rev. 33, 299-324. (in Spanish)