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
Geologic map unit -137.083333333, 59.019444444
Nearby data

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)