Copper Chief Prospect, Admiralty Mining District, Hoonah-Angoon Census Area, Alaska, USA i
Regional Level Types
Copper Chief Prospect Prospect
Admiralty Mining District Mining District
Hoonah-Angoon Census Area Census Area
Alaska State
USA Country

The prospect is now within the Wilderness of the Admiralty Island National Monument and is closed to mineral exploration and development.
Location: The Copper Chief prospect is at sea level about 2.5 miles north of the mouth of Pack Creek. The prospect is 0.7 mile northeast of the southwest corner of sec. 30, T. 45 S., R. 69 E. It is location 65 of Cobb (1972, 1978) and MAS no. 0021140077 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.
Geology: The rocks in the vicinity of the Copper Chief prospect are part of the Triassic Hyd Formation which consists of volcanic rocks, limestone, slate, chert, and conglomerate (Lathram and others, 1965). The Copper Chief prospect has been known since before 1906. Wright (1906) described it as quartz stringers with chalcopyrite, pyrite, and possibly gold in a zone 20 feet wide in quartz schist. The zone is exposed for 200 feet. The deposit was explored by a 60-foot shaft and a 20-foot crosscut prior to 1906. Race and Rose (1967) mostly cite Wright's information but indicate that the ore contains 1 to 1.7 percent copper.
Workings: The only workings are a 60-foot shaft and a 20-foot crosscut driven before 1906.
Age: Triassic or younger based on the age of the host rock.

Commodities (Major) - Au, Cu
Development Status: None
Deposit Model: Quartz veinlets with copper in schist.

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

ⓘ Pyrite

ⓘ 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

ⓘ Pyrite

Formula: FeS₂

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
ⓘ	Pyrite	2.EB.05a	FeS₂
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	ⓘ Pyrite	FeS₂
Fe	Iron
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Pyrite	FeS₂
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂

Other Databases

Link to USGS - Alaska:	SI067

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

Alexander DomainDomain
Alexander TerraneVolcanic Arc

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., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p. Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000. Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p. Lathram, E.H., Loney, R.A., Berg, H.C., and Pomeroy, J.S., 1960, Progress map of the geology of Admiralty Island, Alaska: U.S. Geological Survey Miscellaneous Investigations Map I-323, 1 sheet, scale 1:250,000. Lathram, E.H., Pomeroy, J.S., Berg, H.C., and Loney, R.A., 1965, Reconnaissance geology of Admiralty Island, Alaska: U.S. Geological Survey Bulletin 1181-R, p. R1-R48. Race, W.H., and Rose, A.W., 1967, Geochemical and geological investigations of Admiralty Island, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys, Geochemical Report 8, 45 p. U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html] Wright, C.W., 1906, A reconnaissance of Admiralty Island: U. S. Geological Survey Bulletin 287, p. 138-161.

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