Bluff

Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3371
Tract name Yukon-Tanana Upland (003pCu5003)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -141.48, 63.62
Geologic map unit -141.48, 63.62
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Late Cretaceous–early Tertiary (Inferred from other porphyry molybdenum deposits in the area, for example, Mosquito.)
Age reference geologic inference
Minerals chalcopyrite, galena, magnetite, molybdenite, pyrite, sphalerite
Tectonic setting continental margin
Stratigraphic age Late Cretaceous–early Tertiary

Commodity and development information

Development status Prospect
Major commodities Pb, Zn
Gold-Moly ratio -9999

Reference information

Comments The Bluff prospect contains disseminated pyrite, chalcopyrite, molybdenite, tourmaline, and magnetite within high-level porphyritic quartz monzonite and granodiorite intrusions of mid-Cretaceous to early Tertiary age. Strong hydrothermal alteration. Explored by surface sampling, diamond drilling, and geophysics in the early 1970s; there has probably been more exploration in recent years; staked in 1987 and dropped two years later.
Study area name United States
References U.S. Geological Survey (2014a)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)