Location: The site is at an elevation of 150 feet in a river valley southeast of Jack Bay, and about 2 miles upstream from the head of the bay. It is in the SW1/4 sec. 23, T. 10 S., R. 7 W., of the Copper River Meridian. The location is accurate to within 1000 ft. This prospect is shown as C-96 in Jansons and others (1984).

Geology: The area of this prospect is underlain by Upper Cretaceous Valdez Group metasedimentary rocks (Nelson and others, 1985). A well-defined, 6-inch- wide, quartz vein in slate contains chalcopyrite and pyrrhotite. One grab sample contained 140 ppm Cu and 0.006 oz. Au/ton (Jansons and others, 1984). Gold mineralization in veins cutting the rocks of the Valdez Group is interpreted by Goldfarb and others (1992) to be the result of Tertiary metamorphism.

Age: Tertiary based on the age of the mineralizing event (Goldfarb and others, 1992).

Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1; Goldfarb an

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.

ⓘ Copper

ⓘ Gold

Mineral List

ⓘ Chalcopyrite

ⓘ Pyrrhotite

ⓘ Quartz

3 valid minerals.

Detailed Mineral List:

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

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

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

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

ⓘ Quartz

Formula: SiO₂

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 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
Group 4 - Oxides and Hydroxides
ⓘ	Quartz	4.DA.05	SiO₂

List of minerals for each chemical element

O	Oxygen
O	ⓘ Quartz	SiO₂
Si	Silicon
Si	ⓘ Quartz	SiO₂
S	Sulfur
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂

Other Databases

Link to USGS - Alaska:	CV026

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Yakutat-Malaspina DomainDomain

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

Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., Fechner, S.A. (1984) Mineral occurrences in the Chugach National Forest, southcentral Alaska. U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 pages, 2 sheets, scale 1:250,000.

Nelson, S.W., Dumoulin, J.A., Miller, M.L. (1985) Geologic map of the Chugach National Forest, Alaska. U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 pages, 1 sheet, scale 1:250,000.

Goldfarb, R.J., Leach, D.L., Miller, M.L., Pickthorn, W.J. (1986) Geology, metamorphic setting, and genetic constraints of epigenetic lode-gold mineralization within the Cretaceous Valdez Group, south-central Alaska, in Keppie, J.D., Boyle, R.W., Haynes, S.J. (eds.) Turbidite-hosted gold deposits: Geological Association of Canada Special Paper 32: 87-105.

Bliss, J.D. (ed.) (1992) Developments in mineral deposit modeling. U.S. Geological Survey Bulletin 2004, 168 pages.

Goldfarb, R.J., Case, J.E., Plafker, George, Winkler, G.R. (1992) Maps showing areas of potential for mineral resources in the Cordova and northern Middleton Island 1-degree x 3-degree quadrangles, southern Alaska. U.S. Geological Survey Miscellaneous Field Studies Map MF-2190, 1 sheet, scale 1:250,000.

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