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Porphyry copper prospect in Limón, Costa Rica

Names and other identifiers

GMRAP ID 207
Alternate names Matama II
Tract name Cocos (003pCu4004)
Site status prospect

Geographic location

Country Costa Rica
State or province Limón
Geographic location -83.409, 9.68
Geologic map unit -83.409, 9.68
Nearby data
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Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Miocene
Age reference geologic inference
Minerals bornite, chalcopyrite, malachite, molybdenite, pyrite
Associated rocks andesite, quartz diorite, quartz diorite porphyry, dacite porphyry
Tectonic setting mixed
Stratigraphic age Miocene

Commodity and development information

Development status Prospect
Major commodities Cu
Gold-Moly ratio -9999

Reference information

Comments Resources of 200 Mt at 0.2–0.3% Cu and 100 ppm Mo. Ten holes drilled in 1974; open. Partners: Alcoa in the 1970s. Average values in a 600 m drill hole: 0.28% Cu, 15 ppm Mo, <2g/t Au. Significant prospect.
Study area name Central America and Caribbean Basin
References Nelson (1995); U.S. Geological Survey and others (1987); Singer and others (2008)
Site reference Gray and others (2014)
Nelson, C.E., 1995, Porphyry copper deposits of southern Central America, in Pierce, F.W., and Bolm, J.G., eds., Porphyry copper deposits of the American Cordillera: Arizona Geological Society Digest, v. 20, p. 553–565. (Also available at http://cbmap.net/images/porphyry_copper_deposits.pdf.)Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.U.S. Geological Survey, Dirección General de Geología, Hidrocarburos, y Minas, and Universidad de Costa Rica, 1987, Mineral resource assessment of the Republic of Costa Rica: U.S. Geological Survey Miscellaneous Investigations Map I-1865, 75 p., scale 1;500,000. (Digital data available at http://pubs.usgs.gov/dds/dds19/.)