Iron Cap

Occurrence, Inactive

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



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.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 1/2/2001