Unnamed (south of Mount Golub)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; pyrite
Gangue minerals epidote; garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale B-4
Latitude 58.439
Longitude -135.1853
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site marks the approximate center of several occurrences in the area. They are at an elevation of approximately 2,500 feet, along a west-northwest-trending ridge 3 miles west of Lynn Canal and 1.5 miles south of Mount Golub. The site is in the SE1/4SW1/4 section 33, T. 39 S., R. 62 E. of the Copper River Meridian. The location is accurate within 1 mile.

Geologic setting

Geologic description

The general area is underlain by deformed and metamorphosed Silurian or Devonian carbonate, clastic and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). This occurrence is one of several widely scattered skarn deposits in the area between Nun Mountain and just south of Mount Golub, where a Cretaceous granodiorite pluton intrudes a thick limestone unit (Clough and Redman, 1989). The U.S. Bureau of Mines noted several small, discontinuous garnet-epidote skarns up to a foot thick and several feet long that contain sparse chalcopyrite and pyrite (Clough and Redman, 1989). Samples of skarn contained up to 2,400 ppm copper. A limestone sample contained up to 110 ppm silver, 1,600 ppm lead, 1,600 ppm zinc, and 430 ppm copper (Clough and Redman, 1989).
Geologic map unit (-135.187106852728, 58.4386666862787)
Mineral deposit model Cu skarn deposit (Cox and Singer, 1986; model 18b)
Mineral deposit model number 18b

Production and reserves

Workings or exploration Surface samples only.
Indication of production None