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Koyukuk Arc

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Late Jurassic (?) and Early Cretaceous Koyukuk island arc.
Tract ID 003pCu5007
Country United States of America
Commodity Cu
Study area name United States revised - Alaska
Tectonic setting island arc
Deposit type porphyry copper
Grade-tonnage model Not assessed
Geologic age
Geologic feature age Late Jurassic through Early Cretaceous
Generalized age Mesozoic
Oldest rocks age 161.2Ma
Youngest rocks age 99.6Ma
Age range 61.6Ma
Map scales used 1M

(A quantitative assessment of this tract was not carried out.)

Bibliographic references

General U.S. Geological Survey National Mineral Resource Assessment Team (2002)
U.S. Geological Survey National Mineral Resource Assessment Team, 2002, Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States—A portable document (pfd) recompilation of USGS Open-file Report 96-96 and Circular 1178, recompiled by Paul Schruben: U.S. Geological Survey Open-File Report 02-198, http://pubs.usgs.gov/of/2002/of02-198/.

Deposits and prospects associated with this tract

Name Type State Country Development Details
unnamed prospect Alaska United States Prospect Details