Geothermometry, ore geochemistry and fluid flow in the Esperanza Vein, Huachocolpa District (Huancavelica, Peru)

The Esperanza Zn-Pb-Ag vein, owned by Compañía de Minas Buenaventura S.A.A., lies over 4000 to 4650 masl in the Western Cordillera of the Peruvian Central Andes. The Esperanza low sulphidation epithermal vein trends ~E-W along 1500 m; it dips to the South and can be followed to 350 m depth. As other veins of the district, like Teresita and Bienaventurada, it is hosted by intermediate to felsic volcanics (andesitic to dacitic compositions) of the Huachocolpa Group (Middle Miocene to Upper Pliocene). The mineralisation occurs mostly as open space filling related to fracture development during the Quechua III deformational event. Main ore minerals are sphalerite, galena, tetrahedrite, pyrite, chalcopyrite and Ag and Pb sulfosalts; quartz, barite and calcite are the main gangue minerals. Current production grades are ~5% Zn, ~8Oz/t Ag, ~3% Pb; usually very low Cu (mean ~0.04%).

Constituciones de la Real Hermandad de Nuestra Señora del Sto. Zelo y Esperanza de la salvacion de las Almas

Sign.: *4, *4, 2*4, A-N4

Actos de Fe, Esperanza y Amor de Dios

Contiene una poesia a doble columna al final

Actos de Fe, Esperanza y Amor de Dios

Tít. tomado de comienzo de texto

Actos de Fé esperanza y caridad

Tit. tomado de principio de texto

Explotación de la mina de galena argentífera "Esperanza"

Explotación de la mina de galena argentífera "Esperanza"