National mineral assessment tract AK-WC07 (Epithermal vein, hot spring Au)

Tract AK-WC07
Geographic region West Central, AK
Tract area 4,402sq km
Deposit type Epithermal vein, hot spring Au
Deposit age Cretaceous - Tertiary

Rationale

Explained by Bruce M. Gamble and Marti L. Miller
On the choice of deposit models
This tract is underlain by Late Cretaceous subaerial volcanic rocks that are permissive for Hot Spring Au (+ Hg) epithermal deposits similar to those described by Berger (1986).
On the delineation of permissive tracts
This tract comprises several areas underlain by Late Cretaceous subaerial volcanic rocks (Patton and others, 1994; Moll-Stalcup, 1994), consisting of andesites, rhyolites, and minor basalts.
Important examples of this type of deposit
No epithermal vein deposits are known in the tract.
On the numerical estimates made
Estimates of the number of undiscovered epithermal vein deposits for west-central Alaska were not attempted.
References
Berger, B.R., 1986, Descriptive model of hot-spring Au-Ag, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 143.
Moll-Stalcup, E.J., 1994, Latest Cretaceous and Cenozoic magmatism in mainland Alaska, in Plafker, George, and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North America, v. G-1, p. 589-619.
Patton, W.W., Jr., Box, S.E., Moll-Stalcup, E.J., and Miller, T.P., 1994, Geology of west-central Alaska, in Plafker, George, and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North America, v. G-1, p. 241-269.

Geographic coverage

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