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The epithermal precious metal deposits at Pueblo Viejo in the Dominican Republic contain approximately 18 million ounces of gold and 95 million ounces of silver. Open-pit mining that began in 1975 has removed most of the oxide ore and exposed unweathered rocks at depths as much as 80 m below the original surface. Geologic mapping of these relatively fresh rocks has shown that mineralization is associated with a maardiatreme complex that was emplaced in volcanic rocks of the Lower Cretaceous Los Ranchos Formation.

Mineralization occurs mainly in sedimentary rocks that filled the maar crater. Diamond drilling to depths of 350...

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