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Introduction
Metallogenic evolution of the Caribbean region, Mexico and the northern Andes.
Geology of the Pueblo Viejo deposit, Dominican Republic.
Publications
Publications (33)
Geologic mapping at the Pueblo Viejo Au–Ag–Cu-(Zn) mine, Dominican Republic, and across the surrounding Pueblo Viejo district, reveals the geologic setting at the time of mineralization. Ore deposits consisting of disseminated sulfide, bedded massive sulfide, and high-grade massive sulfide veins formed (~112 Ma) in a volcanic dome field during a pe...
Uplift and unroofing of Jurassic-Cretaceous, mantle and crust, arc-and plume-related rock units in the Median Belt of the Dominican Republic exposed basement rocks with a protracted record of tectono-thermal events delineating the evolution of the northern edge of the Caribbean plate. In this article we focus on crustal rock units in the northeaste...
The region that encompasses Latin America and the Caribbean is a preferential destination for mining and mineral exploration, according to the Mineral Commodity Summaries 2020 of the US Geological Survey (https://www.usgs.gov/centers/nmic/). The region contains important resources of copper, gold, silver, nickel, cobalt, iron, niobium, aluminum, zi...
The region that encompasses Latin America and the Caribbean is a preferential destination for mining and mineral exploration, according to the Mineral Commodity Summaries 2020 of the US Geological Survey (https://www.usgs.gov/centers/nmic/). The region contains important resources of copper, gold, silver, nickel, cobalt, iron, niobium, aluminum, zi...
The Hatillo Limestone and the underlying Los Ranchos Formation are exposed over an east-west distance of 100 km in the eastern Dominican Republic. The lowermost por- tion of the Hatillo Limestone in the Pueblo Viejo district contains a Late Lower Albian fossil assemblage including corals and rudist bivalves indicative of a near-shore reef envi- ron...
The world-class Pueblo Viejo Au deposit in the central Dominican Republic is one of the largest high-sulfidation epithermal Au deposits globally, with past production plus resources and reserves of 41.7 million ounces (Moz) in the Moore and Monte Negro deposits. Mineralization occurs within a 2- × 2-km Early Cretaceous volcano-sedimentary basin fil...
The recently discovered Romero deposit, located in the Tres Palmas district, Cordillera Central of the Dominican Republic, has probable reserves of 840,000 oz gold, 980,000 oz silver and 136 Mlb copper. Mineralization is hosted by intermediate volcanic and volcaniclastic rocks of the lower stratigraphic sequence of the Cretaceous Tireo formation. T...
Volcanic rocks from the Maimón Formation, metamorphosed under greenschist facies conditions, represent the most ancient arc magmatism recorded in the Cretaceous Caribbean island arc. From new geochemical data, and on the basis of immobile trace elements (high field strength elements - HFSE, rare earth elements - REE), a predominance of basaltic pro...
The origin of the world-class Pueblo Viejo deposit, central Dominican Republic, remains controversial. In this article we scale up the area of study to the Cabirma del Cerro mining concession, which abuts the Pueblo Viejo mining area, and integrate new data on the stratigraphy, lithogeochemistry and U-Pb geochronology of volcanogenic units with pre...
Hosted in the Early Cretaceous bimodal tholeiite volcanic series of the Los Ranchos Formation, the Doña Amanda and Cerro Kiosko deposits in the Bayaguana district represent significant Au, Cu, and Ag resources in the Cordillera Oriental of the Dominican Republic. At Doña Amanda, a dense stockwork of quartz-sulfide veins is hosted by volcanic rocks...
The recently discovered Romero deposits, hosted by the Cretaceous Tireo Formation in the Dominican Cordillera Central, has indicated resources of 2.4 M oz. gold. Here we present data on the mineralogy and geochemistry of these deposits for the first time. Gold-Cu-Zn mineralization is divided into: 1) an upper domain with disseminated sulfide minera...
Re-Os dating of three samples of hydrothermal molybdenite collected from the Pueblo Viejo Au-Ag-Cu district (5.5 Moz gold, past production, 16.2 Moz proven plus probable gold ore reserves) yields ages of 112.1 ± 0.4, 112.0 ± 0.4, and 111.5 ± 0.4 Ma. These Re-Os dates confirm an Early Cretaceous age for mineralization, coeval with tholeiitic, intrao...
Mineral resource assessments provide a synthesis of available information about distributions of mineral deposits in the Earth’s crust. The U.S. Geological Survey prepared a probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in Central America and the Caribbean Basin in collaboration with geoscientists f...
The Ampliación Pueblo Viejo (APV) project is located in the central portion of the Hispaniola Island in the Caribbean, and surrounds the famous Pueblo Viejo gold deposit, which has estimate reserves of 248.6 million tonnes of ore grading 2.8 g/t Au and 13.4 g/t Ag. The outcropping rocks in APV and those that host Pueblo Viejo’s ores belong to the E...
The Ampliación Pueblo Viejo (APV) project is located in the central portion of Hispaniola within the world-class Pueblo Viejo gold-silver-copper district. A diamond drill program has recently been carried out at APV, close to the ore deposits and within the limits of the Pueblo Viejo alteration system. Pervasive alteration is present in all of the...
The Ampliación Pueblo Viejo (APV) project is located in the central portion of the Hispaniola Island in the Caribbean and abuts the world-class Pueblo Viejo gold-silver deposit. The origin of Pueblo Viejo, which has 25.3 million ounces of proven and probable reserves in 2012, is a controversial topic in economic geology.A diamond drill program to d...
The North American - Caribbean plate boundary traverses central
Guatemala and northern Honduras, dispersed along three left lateral
faults systems, which from north to south are the Chixoy-Polochic, the
Motagua, and the Jocotán-Camelecón faults, with the
Motagua as the present active strand. The Motagua Suture Zone (MSZ),
which encompasses this are...
Gold mineralization in the Pueblo Viejo district, Dominican Republic is spatially and temporallyrelated to a series of Early Cretaceous volcanic domes. Separate but overlapping hydrothermal cells, centeredon the domes, together deposited more than 40 million ounces of gold, 240 million ounces of silver, 3 milliontonnes of zinc, and 0.4 million tonn...
Gold and copper deposits in Central America are hosted by island arc volcanic rocks of Late Cre-taceous and younger age. Low potassium tholeiitic basalts form the base of the volcanic pile and were deposited in an intraoceanic island arc. Volcanism became more potassic with time, and by Late Miocene time, calc-alkaline andesites dominate the volcan...
Gold mineralization in the Veraguas Gold Belt of Panama is hosted by calc-alkaline volcanic rocks of mid-Miocene age. The volcanic rocks range in composition from basalt to rhyolite and are intruded by coeval exogenous plugs and domes. Pyroclastic aprons surround the domes and host the ore deposits. The Remance mine, a vein and vein stockwork, has...
The Greater Antilles host some of the world’s most important deposits of bauxite and lateritic nickel as well as significant resources of gold and silver, copper, zinc, manganese, cobalt and chromium. Beginning in Jurassic time, sedimentary exhalative base metal deposits accumulated in marine sedimentary rift basins as North and South America drift...
Fluid inclusion and metal-ratio data have been compiled for 52 low-sulfidation precious metal and base metal-rich low-sulfidation epithermal deposits in Mexico. Precious metal deposits typically have inclusion salinities that range from 0 to 7.5 wt percent NaCl equiv, whereas base metal-rich deposits have salinities that are as high as 23 wt percen...
Gold mineralization in the Pueblo Viejo district, Dominican Republic, is spatially and temporally related to a series of
Early Cretaceous volcanic domes. Separate but overlapping hydrothermal cells, centered on the domes, together deposited more
than 40 million oz. of gold, 240 million oz. of silver, 3 million tonnes of zinc, and 0.4 million tonnes...
Exploration for Carlin-type gold orebodies in the western United States typically involves sampling and analysis of jasperoid, a distinctive alteration type formed by intense silicification of marine sediments. In this study, rock suites were collected from six orebodies and four similar but barren systems. Jasperoids at all ten systems contain epi...
Episodes of gold mineralization in the shallow hot spring environment are related in time to hydrothermal eruption events
and in space to the resulting vent breccias and peripheral stockwork zones. It is proposed that large but short-lived overpressures
in a geothermal reservoir, probably triggered by sudden magmatic heat fluxes, induce hydraulic f...
Significant mobilization of U occurred during Boulder Creek (1700-1800 m.y.) as well as the Silver Plume (1390-1450 m.y.) orogeneses. Both Proterozoic and Tertiary controls should be used to explain the U mineralization for this region. Thus the whole Front Range province should be searched for U deposits. -K.A.R.
