Bond Creek

Porphyry copper deposit in Alaska, United States

Names and other identifiers

Tract name Eastern Alaska Range and Wrangell Mountains (003pCu5002)
Site status deposit

Geographic location

Country United States
State or province Alaska
Geographic location -142.733333333, 62.216666667
Geologic map unit -142.733333333, 62.216666667
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 105Ma
Age determination method K-Ar
Age range 114 ±3.4 to 105 ±4.0Ma (Inferred from age of Nabesna pluton.)
Age reference Richter, Lanphere, and Matson (1975)
Minerals anhydrite, biotite, chalcopyrite, chlorite, epidote, gold, kaolinite, magnetite, molybdenite, pyrite, sericite
Associated rocks granodiorite porphyry, quartz monzonite porphyry, andesite, rhyodacite, basalt, granodiorite, marble, metavolcanic rocks, quartz diorite, siltstone, skarn, volcaniclastics
Tectonic setting continental margin
Stratigraphic age Early Cretaceous

Commodity and development information

Development status Occurrence
Major commodities Cu, Mo
Tonnage (Mt) 500Mt
Cu grade (%) 0.3%
Mo grade (%) 0.02%
Contained copper 1,000,000t
Gold-Moly ratio -9999

Reference information

Comments This porphyry copper-molydenum deposit was discovered in the 1960s and explored by some diamond drilling. The deposit is estimated to contain 500 million tons with an average grade of 0.30 percent copper and 0.02 percent molybdenum; some gold and silver values are also likely (Richter and others, 1975). The host rocks are altered over a 2.5 square kilometer area (Richter, 1973). The alteration includes a 600- by 2,000(?)-m central zone with abundant chlorite, minor biotite and potassium feldspar, spotty sericite, and late anhydrite veins. Discovered in the 1960s and explored by some diamond drilling.
Study area name United States
References Hollister (1978); Nokleberg and others (1987); Richter and others (1975); Young and others (1997); Singer and others (2008)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)