Tweeden Prospect, Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The Tweeden prospect is located near the mouth of Gold Creek, where a cliff of Paleozoic greenstone has quartz veins and stringers oriented along along the cleavage; these veins are iron-stained and contain gold (Porter, 1912). Along the lower 4 miles of Gold Creek, Tertiary or Mesozoic granitic rocks crop out (Foster, 1976). In 1911, development at the Tweeden prospect consisted of excavating a 40-foot tunnel at the base of the cliff (Porter, 1912). Operations were discontinued that year when the owner was unable to recover the gold which was very fine.
Workings: In 1911, development at the Tweeden prospect consisted of excavating a 40-foot tunnel at the base of the cliff (Porter, 1912). Operations were discontinued that year when the owner was unable to recover the gold which was very fine.
Commodities (Major) - Au
Development Status: None
Mineral List
2 entries listed. 2 valid minerals.
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References
Cobb, E.H., 1972, Metallic mineral resources map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-393, 1:250,000 scale, 1 sheet. Cobb, E.H., 1977, Summary of references to mineral occurrences in the Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-845, 122 p. Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000. Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000. Porter, E.A., 1912, Placer mining in the Fortymile, Eagle, and Seventymile River districts: U.S. Geological Survey Bulletin 520-G, p. 211-218.