National mineral assessment tract AK-SC30 (Cu (Au) skarn)

Tract AK-SC30
Geographic region South Central, AK
Tract area 4,445sq km
Deposit type Cu (Au) skarn
Deposit age Mesozoic - Tertiary

Rationale

Explained by Bruce M. Gamble, Marti L. Miller, and Thomas D. Light
On the choice of deposit models
In the northwestern part of south-central Alaska, carbonate rocks and units containing carbonate rocks, which have been intruded by Late Cretaceous or Tertiary plutons, may host deposits that fit the Cu-(Au) skarn model of Cox and Theodore (1986) and Theodore and others (1991).
On the delineation of permissive tracts
The permissive area for skarn deposits in this tract encompasses carbonate rocks in the northeastern part of southwestern Alaska (Patton and others, 1994). This tract is a continuation of the permissive tracts in east-central and west-central Alaska.
Important examples of this type of deposit
No Cu (Au) skarn deposits are known in this tract.
On the numerical estimates made
Because of the lack of detailed geological information, and the absence of known deposits, no estimate of the number of undiscovered Cu (Au) skarn deposits was attempted.
References
Cox, D.P., and Theodore, T.G., 1986, Descriptive model of Cu skarn deposits, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 86.
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.
Theodore, T.G., Orris, G.J., Hammarstrom, J.M., and Bliss, J.D., 1991, Gold-bearing skarns, U.S. Geological Survey Bulletin 1930, 61 p.

Geographic coverage

Show this information as XML or JSON