Airplane Ridge

Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3369
Tract name Yukon-Tanana Upland (003pCu5003)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -143.9312, 64.2287
Geologic map unit -143.9312, 64.2287
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 105.8Ma
Age determination method Ar-Ar biotite
Age range 105.8 ±0.4 Ma (Inferred from age of Mount Harper granite.)
Age reference Newberry and others (1998)
Minerals chalcopyrite, magnetite, molybdenite, pyrite
Tectonic setting continental margin
Stratigraphic age Early Cretaceous

Commodity and development information

Development status Prospect
Major commodities Mo, W
Minor commodities Ag, Au, Cu, Sn
Gold-Moly ratio -9999

Reference information

Comments Biotite gneiss, amphibolite, and minor marble crop out at the north and south end of Airplane Ridge; intrusive rocks form the center of the ridge. Limited phyllic alteration of quartz porphyry adjacent to breccia. Molybdenite in a quartz vein on the southern slope of Mount Harper was first reported in 1919. Anomalous tungsten, copper, and molybdenum were found during a stream-sediment reconnaissance in the Mount Harper area in 1975.
Study area name United States
References U.S. Geological Survey (2014a); Dashevsky and others (1986); WGM Inc. (1998); Newberry and others (1998)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)