Unnamed (on Goat Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-3
Latitude 55.20305
Longitude -132.93498
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the west coast of Goat Island about 0.3 mile east-southeast of triangulation station Timmy. It is about 0.5 mile northwest of the southeast corner of section 8, T. 77 S., R. 83 E., of the Copper River Meridian.

Geologic setting

Geologic description

This occurrence was discovered during a search for the source of a gold geochemical anomaly (Maas and others, 1991; Hedderly-Smith, 1999 [Inventory]). The rocks in the vicinity consist of argillite with subordinate volcanic flows, agglomerate, and chert. The argillite is locally silicified and contains small pods of massive pyrite. A sample from a quartz stockwork with 50 percent pyrite and intense hematite and limonite staining contained 0.564 parts per million (ppm) gold and 2.0 ppm silver (Maas and others, 1991).
Geologic map unit (-132.936624733642, 55.2027037340302)
Mineral deposit model Insufficient evidence.
Alteration of deposit A sample from a quartz stockwork with 50 percent pyrite has intense hematite and limonite staining.

Production and reserves

Workings or exploration Only surface sampling by government agency.
Indication of production None

References

References

Reporters D.J. Grybeck (Applied Geology)
Last report date 5/1/2004