Porphyry copper prospect in Alaska, United States

Names and other identifiers

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

Geographic location

Country United States
State or province Alaska
Geographic location -159.2846, 63.2711
Geologic map unit -159.2846, 63.2711
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Late Cretaceous or Tertiary
Age reference geologic inference
Minerals ferrimolybdite, molybdenite
Tectonic setting continental margin
Stratigraphic age Late Cretaceous or Tertiary

Commodity and development information

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

Reference information

Comments Platy aggregates and grains of molybdenite occur in sparse, northeast-trending, milky-white quartz veinlets and veins up to 8 inches in thickness. The veins cut hornfels, clastic sedimentary rocks, minor intermediate to mafic volcanic rocks, and biotite-quartz-feldspar porphyritic dikes, near the southwestern margin of a Cretaceous- or Tertiary-age quartz-feldspar-porphyritic granite stock. The intrusive rocks are locally silicified and sericitized. Several prospect pits and trenches were dug and caved prior to 1945. No underground exploration; surface exploration and mapping was conducted in 1976.
Study area name United States
References U.S. Geological Survey (2014a)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)