Unnamed Occurrence (ARDF - MF083; east of Dundas Bay), Juneau District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Location: The occurrence is at or near the north shoreline of Icy Strait and about 5 miles northeast of the mouth of Dundas Bay. It is approximately located within about 0.5 mile. The approximate location was taken from an unpublished map by Darwin Rossman (MacKevett and others, 1971, locality 33). The site is approximately the same as number 60 of Cobb (1972) and number 69 of Kimball and others (1978).
Geology: The occurrence is an inferred iron deposit based on old claim activity (1903), permissive geology, and the existence of a strong magnetic anomaly reported near the locality by MacKevett and others (1971, p. 70). Geologically, carbonate rocks of Devonian-Silurian age are sandwiched between granite or Cretaceous age to the west and granite of Tertiary age to the east (Brew and others, 1978). The carbonate section is a permissive host for metasomatic iron deposits. Another permissive locality for a contact metasomatic iron occurrence is the southwest contact of Tertiary granite with the carbonate septum about 1/2 mile to the northeast of the first possible locality (MacKevett and others, 1971, pl. I). Iron locality 33 of MacKevett and others is shown within the foliated granite, but the location was from a reported mineral occurrence that was not examined by the U.S. Geological Survey in 1966. Stream-sediment samples anomalous in total heavy metals (THM) were reported near the site.
Workings: Four claims were staked for iron in the area in 1903; five other claims were staked nearby for unspecified commodities before 1953 (Kimball and others (1978, p. C270).
Age: Cretaceous or younger.
Commodities (Major) - Fe
Development Status: No
Deposit Model: Contact metasomatic iron deposit.
Mineral List
1 entry listed. 1 valid mineral.
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References
Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets. Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000. Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375. MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
