Quartz-Porphyry

Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3385
Tract name Yukon-Tanana Upland (003pCu5003)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -143.8916, 64.2262
Geologic map unit -143.8916, 64.2262
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
Minor commodities Cu, W
Gold-Moly ratio -9999

Reference information

Comments Several quartz porphyry dikes intrude a quartz-monzonite pluton and gneiss southeast of VABM Good in the headwaters of the Healy River; well-developed porphyry-style alteration and mineralization in and peripheral to felsic dikes. Molybdenite in a quartz vein on the southern slope of Mount Harper was first reported in 1919. Anomalous tungsten, copper, and molybdenum values 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); Newberry and others (1998)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)