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Porphyry copper deposit in Washington, United States

Names and other identifiers

GMRAP ID 15
Alternate names Central, Northwest
Tract name Intermontane Island-Arc Cu-Au (003pCu2002x)
Site status deposit

Geographic location

Country United States
State or province Washington
Geographic location -119.471211333, 48.988035747
Geologic map unit -119.471211333, 48.988035747
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 179Ma
Age determination method unknown
Age range 179 Ma
Age reference Singer and others (2008)
Minerals albite, azurite/malachite, biotite, bornite, chalcocite, chalcopyrite, chlorite, epidote, garnet, hematite/specularite, magnetite, molybdenite, pyrite, pyrrhotite, sericite
Associated rocks aplite, breccia, diorite porphyry, quartz feldspar porphyry, skarn, gabbro, chert, dacite porphyry, greenstone, quartz diorite
Tectonic setting island arc
Stratigraphic age Jurassic

Commodity and development information

Development status Occurrence
Major commodities Cu
Tonnage (Mt) 285Mt
Cu grade (%) 0.281%
Mo grade (%) 0.0147%
Contained copper 801,000t
Gold-Moly ratio -9999

Reference information

Study area name United States
References Derkey and others (1990); Lasmanis (1995); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Derkey, R.E., Joseph, N.L., and Lasmanis, Raymond, 1990, Metal mines of Washington—Preliminary report: Washington Division of Geology and Earth Resources Open File Report 90-18, 577 p. (Also available at http://panoramagem.com/News/2013/ger_ofr90-18_metal_mines_pt1.pdf, http://panoramagem.com/News/2013/ger_ofr90-18_metal_mines_pt2_1.pdf, http://panoramagem.com/News/2013/ger_ofr90-18_metal_mines_pt2_2.pdf, and http://panoramagem.com/News/2013/ger_ofr90-18_metal_mines_pt2_3.pdf.)
Lasmanis, Raymond, 1995, Regional geological and tectonic setting of porphyry deposits in Washington State, in Schroeter, T.G., ed., Porphyry deposits of the northwestern Cordillera of North America: Canadian Institute of Mining, Metallurgy and Petroleum Special Volume 46, p. 77–102.
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/.