Next Prospect, Chichagof District, Sitka Borough, Alaska, USA
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Location: The Next prospect is at an elevation of about 1,000 feet, about 1.7 miles southeast of the head of Slocum Arm. The prospect is 0.2 mile west-southwest of the center of sec. 22, T. 51 S., R. 60 E. It is location P-96 of Bittenbender and others (1999) and MAS no. 0021140199 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.
Geology: Johnson and Karl (1985) map the rocks in the area of this prospect as Triassic(?) greenstone and marble, Cretaceous(?) phyllite, and the Freeburn assemblage, a collage of kilometer-scale, fault-bounded, lozenge-shaped blocks of Cretaceous and Cretaceous(?) metasedimentary and metavolcanic rocks. The contact between the Triassic(?) strata and the Cretaceous/Cretaceous(?) strata is the regional-scale Border Ranges Fault, a high-angle, northwest-striking fault that passes through just southwest of the prospect. Bittenbender and others (1999), citing Loney and others (1963), describe the prospect as malachite and disseminated pyrite and pyrrhotite in greenstone. Triassic(?) greenstone elsewhere on northwest Chichagof Island generally contains primary sulfide minerals that are about the same age as the greenstone host rock (see, for example, SI035 and SI036).
Age: Triassic(?) greenstone elsewhere on northwest Chichagof Island generally contains primary sulfide minerals that are about the same age as the greenstone host rock.
Commodities (Major) - Cu
Development Status: Undetermined.
Deposit Model: Basaltic copper? (Cox and Singer, 1986; model 23).
3 entries listed. 3 valid minerals.
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Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p. Johnson, B.R, and Karl, S.M., 1985, Geologic map of western Chichagof and Yakobi Islands, southeastern Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map 1-1506, 1 sheet, scale 1:125,000. Loney, R.A., Berg, H.C., Pomeroy, J.S., and Brew, D.A., 1963, Reconnaissance geologic map of Chichagof Island and northwestern Baranof Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-388, 1 sheet, scale 1:250,000. U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]