Location: The Great Eastern prospect is at an elevation of approximately 100 feet on Douglas Island, immediately west of Douglas in Bear Creek and 1/2 mile southeast of Lawson Creek. It is in the NW1/4NE1/4 section 35, T. 41 S., R. 67 E. of the Copper River Meridian. The location is accurate.
Geology: The Great Eastern prospect was discovered in 1888 when a portion of surface was ground-sluiced for gold. There is a 200-foot adit and a short shaft on the prospect. The deposit consists of black phyllite that has been intruded by a swarm of hydrothermally altered diorite sills (Redman and others, 1989). The sills vary from a few inches up to 20 feet thick. Alteration has destroyed most of the mafic minerals. The sills contain up to 3 percent disseminated pyrite. U.S. Bureau of Mines samples contained no significant gold values; they did, however, contain up to 164 ppm molybdenum (Redman and others, 1989). The rocks in the general area are Upper Jurassic or Cretaceous marine argillite and graywacke, interbedded with andesite or basalt (Brew and Ford, 1985). The bedded rocks are regionally metamorphosed to prehnite-pumpellyite or greenschist grade, and cut by diorite or gabbro dikes and sills.
Workings: The deposit at the Great Eastern prospect was discovered in 1888 when a portion of surface was ground-sluiced for gold. There is a 200-foot adit and a short shaft on the prospect.
Alteration: The diorite sills are hydrothermally altered. The alteration has destroyed most of the mafic minerals.
Production: The surface in the vicinity was ground sluiced for gold in 1888 but there is no record of the production.

Commodities (Major) - Au; (Minor) - Mo
Development Status: None

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.

ⓘ Molybdenum

Mineral List

ⓘ Pyrite

1 valid mineral.

Detailed Mineral List:

ⓘ Pyrite

Formula: FeS₂

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
ⓘ	Pyrite	2.EB.05a	FeS₂

List of minerals for each chemical element

S	Sulfur
S	ⓘ Pyrite	FeS₂
Fe	Iron
Fe	ⓘ Pyrite	FeS₂

Other Databases

Link to USGS - Alaska:	JU191

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

Taku DomainDomain
Yukon-TananaVolcanic Arc

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References

Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000. Gehrels, G.E., McClelland, W.C., Samson, S.D., and Patchett, P.J., 1991, U-Pb geochronology of detrital zircons from a continental margin assemblage in the northern Coast Mountains, southeastern Alaska: Canadian Journal of Earth Sciences, v. 28, no. 8, p.1285-1300. Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190. Miller, L.D., Goldfarb, R.J., Gehrels, G,E., and Snee, L.W., 1994, Genetic links among fluid cycling, vein formation, regional deformation, and plutonism in the Juneau gold belt, southeastern Alaska: Geology, v. 22, p. 203-206. Redman, E.C., Maas, K.M., Kurtak, J.M., and Miller, L.D., 1989, Bureau of Mines Mineral Investigations in the Juneau Mining District, Alaska, 1984-1988, Volume 2--Detailed mine, prospect, and mineral occurrence descriptions, Section D, Juneau Gold Belt Subarea: U.S. Bureau of Mines Special Publication, 424 p.

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