National mineral assessment tract AK-EC01 (Besshi massive sulfide)

Tract AK-EC01
Geographic region East Central, AK
Tract area 44,937sq km
Deposit type Besshi massive sulfide
Deposit age Paleozoic - Mesozoic

Rationale

Explained by Jeanine M. Schmidt, Bruce M. Gamble, and Thomas D. Light,
On the choice of deposit models
No massive sulfide deposits are known in this tract. The presence of altered basalts containing pyrite and locally high copper values may suggest submarine hydrothermal activity, and suggest that the area is permissive for Besshi massive sulfide deposits as described by Cox (1986).
On the delineation of permissive tracts
This tract encompasses mafic rocks of Proterozoic(?), Paleozoic, or Mesozoic age (Murchey and Harris, 1985; Pallister and others, 1989).
Important examples of this type of deposit
No Besshi massive sulfide deposits are known in this tract.
On the numerical estimates made
No deposits of this type are known in the area, and no estimates of the number of undiscovered deposits have been attempted.
References
Cox, D.P., 1986, Descriptive model of Besshi massive sulfide, in Cox, D.P., and Singer, D.A., eds., Mineral deposit models: U.S. Geological Survey Bulletin 1693, p. 136.
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.

Geographic coverage

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