National mineral assessment tract AK-WC26 (Zn-Pb skarn)

Tract AK-WC26
Geographic region West Central, AK
Tract area 7,891sq km
Deposit type Zn-Pb skarn
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
The presence of intermediate to felsic plutonic rocks intruding carbonate rocks suggest that this tract is permissive for Zn-Pb skarn deposits as described by Cox (1986).
On the delineation of permissive tracts
This tract is defined by the distribution of carbonate rocks and the known or inferred presence of intermediate to felsic plutonic rocks (Patton and others, 1994; Nokleberg and others, 1994). Known mineral deposits in the area include a Cu-Au skarn and a Fe-skarn. Stream-sediment and heavy-mineral-concentrate samples from within the tract contain anomalous concentrations of Au, As, Sb, Cu, Pb, Zn, Sn, Hg, W, and Bi scattered throughout the area.
Important examples of this type of deposit
No Zn-Pb skarn deposits are known in this tract.
On the numerical estimates made
Because of the lack of detailed geologic information, no estimates of the number of undiscovered deposits have been attempted.
References
Cox, D.P., 1986, Descriptive model of Zn-Pb skarn deposits, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 90.
Nokleberg, W.J., Moll-Stalcup, E.J., Miller, T.P., Brew, D.A., Grantz, Arthur, Reed, J.C., Jr., Plafker, George, Moore, T.E., Silva, S.R., and Patton, William W., Jr., 1994, Tectonostratigraphic terrane and overlap assemblage map of Alaska: U.S. Geological Survey Open-File Report 94-194, 45 manuscript p., scale 1:2,500,000.
Patton, W.W., Jr., Box, S.E., and Grybeck, D.J., 1994, Ophiolites and other mafic-ultramafic complexes in Alaska, in Plafker, George, and Berg, H.C., eds., The Geology of Alaska: Boulder, Colorado, Geological Society of America, The Geology of North American, v. G-1, p. 671-686.

Geographic coverage

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