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Iron Cap

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Fe
Ore minerals chalcopyrite; magnetite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-7
Latitude 60.0124
Longitude -149.2553
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 10 T. 2 S., R. 1 E., of the Seward Meridian at an elevation of about 2,500 feet. This prospect occurs nearly a mile east of the head of Thumb Cove on the south side of Spoon Glacier. This is location 100 of Cobb and Tysdal (1980) and location S-190 of Jansons and others (1984). This location is accurate to within half a mile.

Geologic setting

Geologic description

The occurrence is hosted in pillow basalts of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). It consists of a zone of massive magnetite that grades up-dip into massive chalcopyrite (Tysdal, 1978 [MF-880-A]). The occurrence is reported to be traceable to for 4,500 feet along strike (Grant and Higgins, 1909). No other information available.
Geologic map unit (-149.257436814673, 60.0118400564829)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Cretaceous or younger; the mineralization is in Valdez Group rocks of Late Cretaceous age.

Production and reserves

Workings or exploration No assay results or workings are reported.
Indication of production None

References

References

Cobb, E.H., and Richter, D.H., 1972, Metallic mineral resources map of the Seward quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-466, 2 sheets, scale 1:250,000.
Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107.
Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Martin, G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 1/2/2001