Wilcox

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.2089
Longitude -147.7624
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located at the head of Hogan Bay about 1,500 feet from tidewater at an elevation of 300 feet. It is in the NW1/4 section 5, T. 1 N., R. 10 E., of the Seward Meridian. This is location 119 of Cobb and Richter (1972), location 147 of MacKevett and Holloway (1977), location 251 of Cobb and Tysdal (1980), and location S-28 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect is hosted in graywacke near the contact with greenstone. Both units are the Orca Group of early Tertiary age (Nelson and others, 1985). Three adits were driven to explore the prospect: a 680-foot-long adit at the 315-foot elevation, a 70-foot-long adit at the 1,000-foot elevation, and a short adit above the 1,000-foot elevation (Grant and Higgins, 1909). The first 200 feet of the lower adit cuts greenstone, then it crosses a sheared contact into slate.
The mineralization consists of quartz-chalcopyrite stringers and disseminated chalcopyrite lenses that occur mainly in shear zones. Mineralization in the 70-foot adit is thin stringers of pure chalcopyrite (Grant and Higgins, 1909). Random chip samples collected from the lower adit contained from 35 to 75 ppm copper and no precious metals values (Kurtak, and Jeske, 1986). The U.S. Bureau of Mines did not find the other two workings that are described in the literature.
Geologic map unit (-147.764443599739, 60.2083260561253)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the occurrence is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration In 1908, four substantial long buildings were built on the property by James Mullins Coal Company. Three adits were driven to explore the prospect: a 680-foot-long adit at 315-foot elevation, a 70-foot-long adit at the 1,000-foot elevation, and a short adit above 1,000-foot elevation (Grant and Higgins, 1909). Random chip samples collected from the 680-foot adit by the U.S. Bureau of Mines in 1981 contained from 35 to 75 ppm copper and no precious metals values (Kurtak, and Jeske, 1986).
Indication of production None

References

MRDS Number A010559

References

Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 9/9/2001