1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Unnamed (northwest of Boat Harbor)

Occurrence, Inactive

Map
KML
XML
GeoJSON

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; malachite; pyrite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale C-4
Latitude 58.6473
Longitude -135.2046
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of approximately 300 feet, on a southwest flowing creek that enters the head of Boat Harbor. It is neawr the middle of the E1/2 section 20, T. 37 S., R. 62 E. of the Copper River Meridian. The location is accurate within 1/4 mile.

Geologic setting

Geologic description

This occurrence consists of several short 4- to 10-inch-thick quartz veins, small quartz-calcite veins, and quartz breccia hosted in argillite. The veins contain disseminated chalcopyrite, malachite, pyrite, and sphalerite. U.S. Bureau of Mines samples contained up to 1.8 ppm gold, 2 ppm silver, 670 ppm copper, 320 ppm lead, and 310 ppm zinc (Clough and Redman, 1989). The general area is underlain by metamorphosed Silurian and Devonian clastic rocks, limestone, and volcanic units; Permian limestone and siltstone; and small plutons of Tertiary and Cretaceous granodiorite (Brew and Ford, 1985).
Geologic map unit (-135.206409411826, 58.6469699469575)
Alteration of deposit Oxidation of copper minerals.

Production and reserves

Workings or exploration Only surface samples.
Indication of production None

References

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.
Clough, A.H., and Redman, E.C., 1989, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988, Volume 2, Detailed mine, prospect, and mineral occurrence descriptions, Section C, West Lynn Canal subarea: U.S. Bureau of Mines of Mines Special Publication, 44 p.
Reporters J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date 12/15/2001