Sunny Day

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals chalcopyrite; magnetite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale C-2
Latitude 55.51165
Longitude -132.42278
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location for this old prospect described by Wright and Wright (1908) is vague. However, Sainsbury (1961) found a tunnel at the location used for this site that is probably the old prospect. It is about 0.8 mile west- southwest of Baker Point, and about 0.1 mile northeast of the center of section 25, T. 73 S., R. 85 E., of the Copper River Meridian.

Geologic setting

Geologic description

The deposit at this old prospect is a (quartz?) vein that contains chalcopyrite and low gold and silver values; the vein strikes N 65 E and has a vertical dip (Wright and Wright, 1906; Wright, 1907; Wright and Wright, 1908). he vein is in highly metamorphosed greenstone with marble bands and 'bosses' of diorite, and follows one wall of a wide porphyry dike. The greenstone and marble are part of the Silurian and Ordovician, Descon Formation and the prospect is near a small Cretaceous(?) granitic body near Point Baker (Eberlein and others, 1983; Brew, 1996). An attempt was made to undercut the vein with a 135-foot tunnel that apparently did not reach it. Sainsbury (1961) identified the material on the dump of the tunnel as pyritized greenstone with specks of magnetite; he saw no copper minerals.
Geologic map unit (-132.424459209327, 55.5112866162821)
Mineral deposit model Vein with low silver and gold values.
Age of mineralization Unknown, other than that the vein is in Silurian or Ordovician greenstone and marble. The deposit may be related to a nearby Cretaceous(?) intrusion.

Production and reserves

Workings or exploration The vein was undercut by a 135-foot tunnel that apparently did not reach it.
Indication of production None

References

MRDS Number A010142

References

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