Unnamed (near Boulder Point)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Cu

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale C-3
Latitude 56.5813
Longitude -132.9778
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at Boulder Point along Wrangell Narrows on northeastern Woewodski Island, about 0.4 mile east-southeast of the center of section 18, T. 61 S., R . 80 E. The location is accurate.

Geologic setting

Geologic description

The rocks in the vicinity are part of the Triassic Hyd Group that consists mainly of volcanic flows and breccias, argillite, and some limestone (Brew, 1997; Karl and others, 1999). There is no indication of mineralization here other than Still and others (2002) collected samples of iron-stained andesite along several hundred feet of shoreline that locally contains pyrrhotite and chalcopyrite along fractures. The samples contained 246 to 929 parts per million copper.
Geologic map unit (-132.979517530988, 56.5809506327553)
Age of mineralization Triassic or younger based on the age of the host rock.
Alteration of deposit The andesite host rock is silicified.

Production and reserves

Workings or exploration No workings. Still and others (2002) collected samples as part of a regional mineral assessment by the Bureau of Land Management.
Indication of production None
Reserve estimates None.

References

References

Reporters D.J. Grybeck (Port Ludlow, WA)
Last report date 3/4/2008