Gold Hill

Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3392
Alternate names Su
Tract name Western Alaska Range (003pCu5004)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -147.745, 63.0985
Geologic map unit -147.745, 63.0985
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Tertiary
Age reference geologic inference
Minerals arsenopyrite, chalcopyrite, enargite(?), gold, molybdenite, pyrite, pyrrhotite
Tectonic setting continental margin
Stratigraphic age Tertiary

Commodity and development information

Development status Prospect
Major commodities Au, Cu, Mo
Minor commodities As
Gold-Moly ratio -9999

Reference information

Comments Mineralization occurs mainly in and at the periphery of dikes and stocks of early Tertiary-age quartz monzonite and hornblende diorite; silicification, propylitic and argillic alteration, hornfelsing near the intrusion. First located in 1972; considerable geochemical surveys, trenching, and sampling; 22 diamond-drill holes. From 1977–1996, 27 diamond-drill and 21 reverse-circulation holes, mostly for gold. Drilled for molybdenum in 2007; best intercepts in 4 drill holes included 250 ft of 0.048 percent molybdenum, 750 ft of 0.044 percent molybdenum, 250 ft of 0.0361 percent molybdenum, and 352 ft of 0.0434 percent molybdenum. Drilled another 10 holes in 2008; best hole cut quartz-pyrite-molybdenite mineralization for 536 ft that averaged 0.048 percent molybdenum. No reserves.
Study area name United States
References U.S. Geological Survey (2014a)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)