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Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3416
Alternate names Unnamed (in upper Slope Creek)
Tract name Eastern Alaska Range and Wrangell Mountains (003pCu5002)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -144.01, 62.79
Geologic map unit -144.01, 62.79
Nearby data
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Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Jurassic or younger
Age reference geologic inference
Minerals arsenopyrite, chalcopyrite, galena, magnetite, malachite, sphalerite
Tectonic setting continental margin
Stratigraphic age Jurassic or younger

Commodity and development information

Development status Prospect
Major commodities Au, Cu
Minor commodities Fe, Pb, Zn
Gold-Moly ratio -9999

Reference information

Comments Highly altered volcanic rocks of the Pennsylvanian- to Permian-age Tetelna Formationare cut by by composite dikes and irregular bodies of a mid-Jurassic-age diorite to quartz diorite complex. Porphyry-type mineralization occurs mainly in the diorite complex and adjacent hornfels. Potassic alteration (with the introduction of K-feldspar and biotite in the core of the system); locally the rocks are sericitized and phyllically altered; higher in the system, the rocks are silicified, altered to clay, and carbonatized.
Study area name United States
References U.S. Geological Survey (2014a)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)
U.S. Geological Survey, 2014a, Alaska Resource Data File (ARDF): U.S. Geological Survey database, accessed February 5, 2014, at http://mrdata.usgs.gov/ardf/.