Location: The approximate location of this prospect is at the south entrance of Alava Bay, about 1.8 mile southwest of Ape Point. The site is in section 6, T. 77 S., R. 94 E., of the Copper River Meridian. It corresponds to loc. 100 in Elliott and others (1978), who erroneously placed it at the north corner of Alava Bay. The location is probably accurate within about 0.5 mile.
Geology: The country rocks at Alava Bay include: Permian marble; an assemblage of undivided Mesozoic or upper Paleozoic, metamorphosed sedimentary, volcanic, and intrusive rocks; a stock, dikes, and sills of Cretaceous granodiorite; and a plug and associated dikes of ultramafic hornblendite and pyroxenite, also of Cretaceous age (Berg and others, 1988). The marble, the undivided assemblage, and some of the Cretaceous granodiorite were regionally metamorphosed to greenschist grade in middle or Late Cretaceous time. These metamorphic rocks subsequently were remetamorphosed to hornblende hornfels grade near the contacts of intrusive rocks that were emplaced after the regional metamorphism. The structural base of the Permian marble is a thrust fault that dips gently to moderately northeast. The deposit consists of magmatic titaniferous magnetite in a Cretaceous hornblendite-pyroxenite plug or dike that apparently intrudes both the Cretaceous granodiorite and the undivided metamorphic assemblage (Berg and others, 1978, p. 24,25; Berg and others, 1988). The magnetite occurs as individual crystals and as streaks and small, podlike segregations in the ultramafic rocks. The deposit was examined by private interests in the 1960s, but the results of that examination have not been made public.
Workings: The deposit was examined by private interests in the mid-1960s, but the results of that examination have not been made public.
Age: Cretaceous.

Commodities (Major) - Fe
Development Status: None
Deposit Model: Alaskan PGE (Cox and Singer, 1986; model 9)

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

ⓘ var. Titanium-bearing 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

ⓘ Magnetite var. Titanium-bearing Magnetite

Formula: Fe²⁺(Fe³⁺,Ti)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
ⓘ	var. Titanium-bearing Magnetite	4.BB.05	Fe²⁺(Fe³⁺,Ti)₂O₄

List of minerals for each chemical element

O	Oxygen
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
Ti	Titanium
Ti	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄
Fe	Iron
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Magnetite var. Titanium-bearing Magnetite	Fe²⁺(Fe³⁺,Ti)₂O₄

Other Databases

Link to USGS - Alaska:	KC103

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

Taku DomainDomain
Yukon-TananaVolcanic Arc

USA

Alaska
- Ketchikan Mining DistrictMining District

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Berg, H.C., Elliott, R.L., and Koch, R.D., 1978, Map and tables describing areas of metalliferous mineral resource potential in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73-M, 52 p., 1 sheet, scale 1:250,000. Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 p., scale 1:250,000. Elliott, R.L., Berg, H.C., and Karl, S.M.,1978, Map and table describing metalliferous and selected non-metalliferous mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73B, 17 p., 1 sheet, scale 1:250,000.

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