J and J

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals gold
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-7
Latitude 60.5612
Longitude -149.5075
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located in the SE1/4 section 31 and the SW1/4 section 32, T. 6 N., R. 1 W., of the Seward Meridian. It is situated on a ridge above Johns Creek about 2.5 miles east of the Seward Highway at an elevation of about 4,100 feet. This is location S-247 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

This occurrence consists of quartz-calcite veins hosted in the slate and sandstone of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The veins strike N40W and dip 57SW. (Jansons and others, 1984). No sulfides were identified in the veins. Two grab samples collected by the U.S. Bureau of Mines in 1981 did not contain any precious metals values (Hoekzema and Sherman, 1983).
Geologic map unit (-149.509625653892, 60.5606090752712)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration The U.S. Bureau of Mines visited this occurrence in 1979. They collected two grab samples that did not contain any precious metals. Placer gold has been mined from Johns Creek below this occurrence (Hoekzema and Sherman, 1983).
Indication of production None

References

References

Reporters Jeff A. Huber (Anchorage)
Last report date 3/3/2000