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Natural resources

The island also has an economic history and current day interest and involvement in precious metals. In 1860, it was observed that the island contained a large supply of gold, which the early Spaniards had hardly developed. By 1919, Condit and Ross noted that much of the island was covered by government granted concessions for mining different types of minerals. Besides gold, these minerals included silver, manganese, copper, magnetite, iron and nickel.

Mining operations in 2016 have taken advantage of the volcanogenic massive sulfide ore deposits around Maimón. To the northeast, the Pueblo Viejo Gold Mine was operated by state-owned Rosario Dominicana from 1975 until 1991. In 2009, Pueblo Viejo Dominicana Corporation, formed by Barrick Gold and Goldcorp, started open-pit mining operations of the Monte Negro and Moore oxide deposits. The mined ore is processed with gold cyanidation. Pyrite and sphalerite are the main sulfide minerals found in the 120-meter thick volcanic conglomerates and agglomerates, which constitute the world's second largest sulphidation gold deposit.

Between Bonao and Maimón, Falconbridge Dominicana has been mining nickel laterites since 1971. The Cerro de Maimon copper/gold open-pit mine southeast of Maimón has been operated by Perilya since 2006. Copper is extracted from the sulfide ores, while gold and silver are extracted from both the sulfide and the oxide ores. Processing is via froth flotation and cyanidation. The ore is located in the VMS Early Cretaceous Maimón Formation. Goethite enriched with gold and silver is found in the 30-meter thick oxide cap. Below that cap is a supergene zone containing pyrite, chalcopyrite, and sphalerite. Below the supergene zone is found the unaltered massive sulphide mineralization.