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Location: 1.5 km SE from Porco, Bolivia
Av, Arce #2299 ED. Multicentro Torre B P1 Y P2La PazBolivia
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Santacruz indirectly owns 100% of the two Bolivian operating companies Contrato de Asociación Sociedad Minera Illapa S.A. and Sinchi Wayra S.A.
Sinchi Wayra is the operating company for all three active mining operations, including the Porco Mine.
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The Porco silver-zinc-tin deposit is located 35 km southwest of the Cerro Rico de Potosí deposit on the southeastern edge of the Los Frailes volcanic field. It was the first silver deposit discovered in Bolivia, with exploitation dating to pre-colonial times. Deposit TypeThe most important ore deposits of the Eastern Cordillera are polymetallic hydrothermal deposits mined principally for Sn, W, Ag and Zn, with sub-product Pb, Cu, Bi, Au and Sb. They are related to stocks, domes and volcanic rocks of Middle and Late Miocene age (22 to 4 Ma). Mineralization occurs in veins, fracture swarms, disseminations and breccias. The deposits of the Eastern Cordillera are epithermal vein and disseminated systems of Au, Ag, Pb, Sb, as that have been telescoped on to higher temperature mesothermal Sn-W veins and, in some cases, porphyry Sn deposits. The “telescoping” is a characteristic of these deposits and is the product of the collapse of a hydrothermal system, whereby younger lower temperature fluids overprint the alteration and mineralization developed by older higher temperature fluids. The systems show a fluid evolution from a high temperature, low sulfidation state to intermediate sulfidation epithermal and high sulfidation epithermal. MineralizationMineralization occurs in NNE to NE-trending veins that cut the Porco Tuff about 1 km east of the Huayna Porco stock. The deposit is zoned around the stock with cassiterite proximal to the stock and base metals, mainly sphalerite and galena, further away. The upper parts of the veins are silver-rich with pyrargyrite, acanthite and stephanite. The main structure is the San Antonio vein which strikes N10º - 30ºE and dips between 70º and 85º to the east. It is 300 m in vertical extent and 1.2 m to 2.0 m in width. To the south, the vein branches into the Oriente, Misericordia, and Santos veins, whose lengths vary between 500 m to 1,500 m. The main ore minerals are pyrite, sphalerite, galena, argentiferous galena, native silver, chalcopyrite, and arsenopyrite in a gangue of quartz. Other important structures are the Muestra Grande vein on Huayna Porco Hill, where the grade reached 2,300 g/t Ag (Sugaki et al., 1983), and the Rajo Zúñiga vein, which strikes N30ºE and dips 75º-80ºE. The latter vein, with widths between 1.0 m and 1.5 m, was exploited in a 100 m x 20 m open pit. This altered dacite-hosted vein is accompanied by associated veinlets and disseminations in the wall rock and consists of cassiterite, wolframite, galena, silver sulphosalts, and pyrite.The characterization of the mineralization at the Porco site may be summarized as follows:• Hydrothermal reservoir;• Epithermal phase, which allows the uptake of base metals (Zn, Pb, Cu) and (Au-Ag) of low sulphidation;• Vein type;• Temperature range, 50°C - 300°C;• Deposit depth, between 50 m-500 m depth from the surface;• Mineralization can be internally heterogeneous, with low to high-strength sectors and sterile sectors;• Filled in fractures or zones of weakness;• Vein systems can be parallel, reticular, convergent and or conjugate;• Plutonic rocks of intermediate to acidic composition are favorable;• Epithermal deposits are generally associated with Tertiary volcanism and very few older deposits;• Alteration is predominantly sericitization, hydration, carbonatization, pyritization and propylitization; and• The Porco deposit is typical Philonian type deposit, the mineralization to refill the fractures within the superjacent Ordovician slate north of the deposit.The mineralized zones or veins are polymetallic, monoclinal banded structures but may also be crustiform or in geodes presenting in rosary form. Thicknesses range from between 0.01 m to 4.0 m but can reach widths of ~10.0 m usually in rameada form interspersed with country rock or mineral gangue.Veta San Antonio PrincipalThe San Antonio structure is located in the main corridor striking N 10° - 30°E with dips ranging between 60°-75° and is developed from the Santacruz level to the -330 level. The mineralogy of the San Antonio Principal vein, located in the central sector of the deposit), consists of sphalerite, pyrite, galena, marcasite, which correspond to the intermediate phase of the mineralization this is changing towards depth enriching in marmatite, pyrite.Elena VeinThe structure is located in a fault oriented N 10° - 50°E and dipping between 40°-62° which is developed from the San Cayetano level to the -330 level. The mineralogy of the vein consists of sphalerite, pyrite, galena, siderite kaolin, which corresponds to the intermediate phase of the mineralization this changing at depth enriching in marmatite and pyrite.Vein Ramo ElenaThe structure is located between the main San Antonio and Elena veins in direction and diving ranging from N 70° - 80°W/50°-75° in vertical longitude is developed from level 105 to level -195. The mineralogy of the vein consists of marmatite pyrite galena, and they correspond to the late phase of mineralization.Vein RosarioThe Rosario structure is located between the Elena and Ramo Elena veins oriented N 10° - 30° W and dipping 55°-65° which developed from level 60 to level -195. The mineralogy of the vein consists of sphalerite, pyrite, galena, siderite kaolin, which corresponds to the intermediate phase of mineralization.Vein RH6The RH6 structure is located at the intersection of the Huayna Porco stock and Apo Porco becoming part of the Pamela, Crucera II, Larga 3, Crucera IV, Crucera Pamela, Ramo Pamela and H-6 vein system. This corridor has high concentrations of silver sulfosalts compared to the rest of the corridors. All the structures that are contained in this vein system oriented N 10°W - N 40°E and dipping 60°SW- 70°SE which has been developed from the Huayna Porco level to the -240 level. The mineralogy of the vein consists of sphalerite, marmatite, pyrite, galena, sulfosalts, siderite, and hat correspond to the intermediate phase of the mineralization.Veta Colorada UnoThe Veta Colorada Uno is located along a corridor north of the Huayna Porco stock that emerges from the main Hundimiento vein, with an orientation of N 5°E. Located in Tertiary age dacitic rocks the vein has approximate length of 500 m in length with thicknesses that average 2 m and occur in the form of massive veins. The mineralogical content consists of ~70% sphalerite, ~10% pyrite, ~10% galena and ~10% marmatite. However, at deeper levels the percentages are reversed reducing to 45% sphalerite and 5% galena, with the marmatite and pyrite proportionally increases at depth.Veta HundimientoThe Hundimiento zone corridor intersects the Huayna Porco stock at an orientation of N 15°E. It is hosted in Tertiary age dacitic rocks extending ~1,000 m in length with average widths of 3 m in the form of massive veins. The mineralogical content consists of ~30% sphalerite, ~50% pyrite, ~10% galena, ~5% marmatite and ~5% siderite. However, the percentages are decrease at depth to ~25% sphalerite and ~2% galena; while pyrite proportionally increases at depth but marmatite and siderite remain at depth.Vein CaliforniaVeta California is located in the Hundimiento zone corridor where it intersects the Huayna Porco stock parallel to the Hundimiento vein at an orientation of N 15-20° E. Veta California is hosted in Tertiary age dacitic rocks extending approximately 1,000 m with average widths of 1.5 m in the form of gaped veins. The mineralogical content consists of ~60% sphalerite, ~10% pyrite, ~5% galena and ~25% marmatite. However, as the vein deepens the percentages decrease to ~45% sphalerite and ~20% marmatite; while pyrite increases proportionally, and siderite begins to appear.
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