| conc_proc: | VEINS ARE STRONGLY OXIDIZED AND LEACHED TO DEPTHS OF 7-10 M BELOW SURFACE, THE ORE CONSISTING OF COPPER CARBONATES, ATACAMITE, CHRYSOCOLLA, ANTLERITE, COPPER OXIDES AND NATIVE COPPER. FROM 10-40 M BELOW THE SURFACE, A ZONE OF SUPERGENE ENRICHMENT WITH CHALCOCITE, COVELLITE, AND BORNITE WAS FOUND. ORE AVERAGES 4-5% COPPER, 200-250 GRAMS SILVER AND 4-5 GRAMS GOLD PER TON. IN THE SAN PEDRO ZONE, WALL ROCK IS SLIGHTLY ALTERED TO CALCITE, EPIDOTE, AND CHLORITE. |
| ore_ctrl: | THE ROCKS OF THE AREA ARE A RATHER COMPLEX ASSEMBLAGE OF GRANITIC ROCKS WHICH HAVE NOT BEEN STUDIED ADEQUATELY AS YET. THE OLDEST ROCKS SEEM TO BE A LIGHT GRAY COARSE-GRAINED EQUIGRANULAR HORNBLENDE BIOTITE DIORITE CUT BY DARK GREEN PORPHYRITIC ANDESITE DIKES. THIS ROCK IS INTRUDED BY A EQUIGRANULAR GRANODIORITE COMPOSED OF PLAGIOCLASE, ORTHOCLASE, HORNBLENDE, AND BIOTITE. THE VEINS ARE RELATED TO A DARK FINE- TO VERY FINE-GRAINED DIORITE FACIES OF THE GRANODIORITE. VEIN MATERIAL CONSISTS OF MILKY WHITE COARSE CALCITE WITH MASSIVE CHALCOPYRITE, PYRITE, AND A LITTLE GLASSY, FERRUGINOUS OR MILKY QUARTZ, COMPACT GRANULAR MAGNETITE, RHODOCHROSITE, CHLORITE, AND TOURMALINE. MARCASITE AND BISMUTHINITE HAVE BEEN REPORTED AND CUPRIFEROUS HETEROGENITE (HYDROUS COBALT OXIDE) WAS IDENTIFIED TENTATIVELY BY PFLUCKER (1948). CALCITE APPEARS TO BE AN EARLY MINERAL AND WAS FOLLOWED BY COPPER MINERALIZATION. |
| References: |
- Deposit:: SIMONS, FRANK, 1960, UNPUBLISHED REPORT, P. 663
- Deposit:: PERU-MAPA METALOGENETICO, 1969, AND, GUIA PARA EL MAPA METALOGENETICO DEL PERU, SOCIEDAD NACIONAL DE MINERIA Y PETROLEO, LIMA, PERU, NOV. 1969
- Deposit:: OLAECHEA, TEODORICO, 1888, LIGERA RELACION DEL VIAGE A LA PROVINCIA DE ICA: BOL. MINAS, IND. Y CONSTR., SER. 1, V. 4, P. 37-39, 42-46
- Deposit:: FUCHS, FREDERICO G., 1905, LA REGION CUPRIFERA DE LOS ALREDEDORES DE ICA Y NAZCA: CUERPO DE ING. DE MINAS DEL PERU BOL. NO. 29, P. 41-54.
- Deposit:: FUCHS, FREDERICO G., 1944, EL COBRE EN EL PERU: SOC. NAC. DE MINERIA Y PETROLEO BOL., V. 1, NO. 2, P. 35-39.
- Deposit:: NARDUCCI, M. 1888, APUNTES RETROSPECTIVOS SOBRE LOS MINERALES DE COBRE DE LA PROVINCIA DE ICA: BOL. MINAS, IND. Y CONSTR., V. 4, P. 12-15, 18-22.
- Deposit:: PFLUCKER, LUIS A., 1948
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