MacKevett and others (1971, p. 70) cited a magnetic anomaly on the north side of Icy Strait near their locality 33. The size of the magnetic anomaly suggests that a substantial iron deposit is possible. The magnetic anomaly is on USC & GS Chart No. 8202, 13th edition. The site is in Glacier Bay National Park and Preserve.
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 The approximate location was taken from an unpublished map by Darwin Rossman (MacKevett and others, 1971, locality 33).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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Iron

Mineral List

ⓘ Magnetite

1 valid mineral.

Detailed Mineral List:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄

List of minerals for each chemical element

O	Oxygen
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	Iron
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄

Other Databases

Link to USGS - Alaska:	MF083

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

Alexander DomainDomain
Alexander TerraneVolcanic Arc

USA

Alaska
- Juneau Mining DistrictMining District

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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.

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