National mineral assessment tract AK-WC22 (Polymetallic vein)

Tract AK-WC22
Geographic region West Central, AK
Tract area 66,650sq km
Deposit type Polymetallic vein
Deposit age Mesozoic - Tertiary

Rationale

Explained by Bruce M. Gamble, Robert G. Eppinger, John W. Cady, Stanley E. Church, Byron R. Berger, Gregory T. Spanski
On the choice of deposit models
Polymetallic vein deposits can be associated with intrusive rocks of any age and a wide range of compositions (Cox, 1986). Polymetallic veins may also be spatially related to a large number of other types of magmatic-hydrothermal deposits, thus making their permissive area quite extensive.
On the delineation of permissive tracts
This tract includes that part of west-central Alaska south of the Kaltag fault, and is contiguous to the tract in southwestern Alaska. It is based on the distribution of known and inferred plutonic rocks, some of which are Late Cretaceous or early Tertiary volcano-plutonic complexes, in sedimentary and metamorphic terranes. Only reconnaissance level data are available to define the extent of the tract. Stream-sediment and/or concentrate anomalies of Au, As, Sb, Cu, Pb, n, Sn, Hg, and Bi are scattered throughout the area..
Important examples of this type of deposit
There are several scattered occurrences that have been tentatively classified as polymetallic veins. The Wyoming Creek, Illinois Creek, and Perseverance Valley occurrences may be polymetallic veins.
On the numerical estimates made
Due to the paucity of geologic data in most of the area, and our uncertainty assigning this model, no estimate of undiscovered resources was made.
References
Cox, D.P., 1986, Descriptive model of polymetallic veins, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 125.

Geographic coverage

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