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Jacinto, Camaguey District |
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Cuba |
| Main commodities:
Au
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Super Porphyry Cu and Au
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The Jacinto gold deposit is located within the Camagüey District of central Cuba, some 550 km south-east of Havana.
The district is part of a belt of epithermal precious metal deposits within the Greater Antilles (the islands of Cuba, Hispaniola - subdivided into Haiti & the Dominican Republic - and Puerto Rico) developed within volcanics that range from Jurassic to Eocene in age and rest on a basement of oceanic crust. These volcanics have been subdivided into a primitive island-arc volcanic phase (which hosts such deposits as Pueblo Viejo in the Dominican Republic) and a later calc-alkaline volcanic phase which hosts Jacinto and the Camagüey epithermal province in Cuba.
The volcanic sequence hosting the Jacinto deposit commences with submarine alkaline basalts and andesites of the Camujiro Formation, which are followed by a suite of felsic volcanics, well layered tuffs and epiclastics composed of felsic volcanic debris, with local limestone. These volcanics were intruded by the 130 to 58 Ma Camagüey batholith which comprises gabbro, through syenite to granodiorite (the latter being the most important component and mainly emplaced between 91 and 82 Ma). All of these rocks are overlain and intruded by the La Sierra rhyolitic to dacitic flows and domes which were emplaced onto an erosional surface at around 74 Ma.
Jacinto is a low sulphidation, adularia-sericite epithermal vein system hosted by the Cretaceous Camujiro Formation basal basalts and andesites along the margin of the Camagüey batholith. They generally coincide with a north-west trending series of La Sierra intrusives which pass through the district.
The deposit is composed of more than five veins (Beartriz, Elena, South Elena, El Limon and La Ceiba) exposed over an area of 5 sq. km, each of which may be up to 1 km in length, with widths of 1 to 2 m up to a maximum of 60 m (where the vien is represented by a stockwork zone) and vertical extents of at least 150 m. They are almost entirely composed of quartz, with minor amounts of adularia, commonly bladed calcite, pyrite and gold. Gold ore shoots are continuous horizontally, but restricted vertically. Wall rock alteration is limited, consisting of minor K feldspar and sericite. The veins have been dated at 72 Ma and may be related to the La Sierra rhyolite flows and domes of the same age which were extruded onto the eroded Camagüey batholith.
Grades of these veins average from 1 to 15 g/t with individual assays of 50 to 200 g/t over narrow intervals. Stockwork zones may average 2.75 g/t Au over widths of 20 m.
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2000.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Hall C M, Kesler S E, Russell N, Pinero E, Sanchez C. R, Perez R. M, Moreira J, and Borges M 2004 - Age and Tectonic Setting of the Camaguey Volcanic-Intrusive Arc, Cuba: Late Cretaceous Extension and Uplift in the Western Greater Antilles: in J. of Geol. v112 pp 521-542
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Kesler S E, Hall C M, Russell N, Pinero E, Sanchez C. R, Perez R. M, and Moreira J 2004 - Age of the Camaguey Gold-Silver District, Cuba: Tectonic Evolution and Preservation of Epithermal Mineralization in Volcanic Arcs: in Econ. Geol. v99 pp 869-886
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Simon G, Kesler S E, Russell N, Hall C M, Bell D, Pinero E 1999 - Epithermal gold mineralization in and old volcanic arc: The Jacinto deposit, Camaguey District, Cuba: in Econ. Geol. v94 pp 487-506
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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