Round Top, Porphyry copper deposit

Round Top

Porphyry copper deposit in Alaska, United States

Names and other identifiers

GMRAP ID	2
Tract name	Yukon-Tanana Upland (003pCu5003)
Site status	deposit

Geographic location

Country	United States
State or province	Alaska
Geographic location	-157.05, 64.133333333 (click for info)
Geologic map unit	-157.05, 64.133333333
Nearby data	List Map

Geologic information

Deposit type	Porphyry copper
Age (Ma)	75Ma
Age determination method	unknown
Age range	75 Ma
Age reference	Singer and others (2008)
Minerals	actinolite, biotite, calcite, chalcocite, chalcopyrite, chlorite, epidote, galena, montmorillonite, pyrite, sphalerite, tetrahedrite
Associated rocks	breccia, quartz monzonite porphyry, skarn, amphibolite, shale
Tectonic setting	continental margin
Stratigraphic age	Late Cretaceous

Commodity and development information

Development status	Occurrence
Major commodities	Cu
Tonnage (Mt)	55Mt
Cu grade (%)	0.2%
Contained copper	100,000t
Gold-Moly ratio	-9999

Reference information

Study area name	United States
References	Young and others (1997); Singer and others (2008)
Site reference	U.S. Geological Survey National Mineral Resource Assessment Team (2002)

Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the worldDatabase 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/.

Young, L.E., St. George,P., and Bouley, B.A., 1997,Porphyry copper deposits in relation to the magmatic history and palinspastic restoration of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska: Economic Geology Monograph 9, p. 306333.