Margerie Glacier, Porphyry copper deposit

Margerie Glacier

Porphyry copper (Cu-Au) deposit in Alaska, United States

Names and other identifiers

GMRAP ID	13
Alternate names	Porcupine
Tract name	Southeast Alaska Tertiary (003pCu5005)
Site status	deposit

Geographic location

Country	United States
State or province	Alaska
Geographic location	-137.083333333, 59.019444444 (click for info)
Geologic map unit	-137.083333333, 59.019444444
Nearby data	List Map

Geologic information

Deposit type	Porphyry copper
Deposit subtype	Cu-Au
Age (Ma)	34Ma
Age determination method	unknown
Age range	34 Ma
Age reference	Singer and others (2008)
Minerals	arsenopyrite, biotite, chalcopyrite, chlorite, epidote, molybdenite, pyrite, pyrrhotite, scheelite, sericite, sphalerite
Associated rocks	quartz monzonite porphyry, hornfels, andesite, marble, shale, metavolcanic rocks
Tectonic setting	continental margin
Stratigraphic age	Tertiary

Commodity and development information

Development status	Occurrence
Major commodities	Cu
Tonnage (Mt)	145Mt
Cu grade (%)	0.2%
Au grade (g/t)	0.24g/t
Ag grade (g/t)	4.5g/t
Contained copper	300,000t
Gold-Moly ratio	-9999

Reference information

Study area name	United States
References	Nokleberg and others (1987); Singer and others (2008)
Site reference	U.S. Geological Survey National Mineral Resource Assessment Team (2002)

Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p. (Also available at http://pubs.usgs.gov/bul/1786/report.pdf.)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/.