National mineral assessment tract AK-EC02 (Cyprus massive sulfide)

Tract AK-EC02
Geographic region East Central, AK
Tract area 17,538sq km
Deposit type Cyprus massive sulfide
Deposit age Jurassic

Rationale

Explained by Jeanine M. Schmidt and Thomas D. Light
On the choice of deposit models
Altered basalts with pyrite and locally high copper values may suggest submarine hydrothermal activity, and the area is permissive for Cyprus massive sulfide deposits as defined by Singer (1986).
On the delineation of permissive tracts
This tract contains mafic rocks of Proterozoic(?), Paleozoic, or Mesozoic age similar to those rocks in the southern flank of the Brooks Range (Murchey and Harris, 1985; Pallister and others, 1989).
Important examples of this type of deposit
No Cyprus-type deposits are known in the area.
On the numerical estimates made
No estimates of the number of undiscovered deposits have been attempted.
References
Murchey, B.L., and Harris, A.G., 1985, Devonian to Jurassic sedimentary rocks in the Angayucham Mountains of Alaska: possible sea mount or oceanic plateau deposits [abs]: EOS, Transactions of the American Geophysical Union, v. 66, no. 46, p. 1102.
Pallister, J.S., Budahn, J.R., and Murchey, B.L., 1989, Pillow basalts of the Angayucham terrane: oceanic plateau and island crust accreted to the Brooks Range: Journal of Geophysical Research, v. 94, no. B11, p. 15,901-15,923.
Singer, D.A., 1986, Descriptive model of Cyprus massive sulfide, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 131.

Geographic coverage

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