Joker Group

Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale CI
Quadrangle map, 1:63,360-scale B-2
Latitude 65.432
Longitude -146.769
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Joker Group can be reached via an 8 mile long dirt road that starts in Circle Hot Springs. The claims are above the confluence of Bottom Dollar and Half -Dollar Creeks. The coordinates are for the approximate center of the Joker Group claims.

Geologic setting

Geologic description

The bedrock in the Joker claims groups is primarily porphyritic igneous rock containing large K-spar phenocrysts. Visible gold is found in the quartz veins. Both lode and placer gold are found at these claims (Vetter, 1995).
Wiltse and others (1995) mapped the bedrock in the area as Cretaceous chloritized porphyritic (hornblende) biotite monzogranite to syenogranite. They also mapped a mafic dike in the area of the 88 Group claims which is described as black to dark gray, aphanitic to slightly porphyritic, with major plagioclase, augite, hornblende and magnetite.
The granite is exposed along several ditches where it is deeply weathered and fractured. Abundant visible gold is seen in the stockwork veining. The light yellow color of the gold suggests a high silver content. Placer gold from the creeks below has a fineness of 750. Sampling in the vicinity of the Joker claims failed to delineate any significant extent to the stockwork veining; however, the trend of the stockwork veining is parallel to the ditch exposure, which is not as continuous as that at the 88 Group (Bakke, 1991).
Geologic map unit (-146.771483300946, 65.4315974731744)
Age of mineralization Mineralization is later than the Cretaceous granitic host rocks.

Production and reserves

Workings or exploration Surface samples taken.
Indication of production None

References

References

Bakke, Arne, 1991, Fairbanks gold, in Vetter, 1995, Joker and 88 group, property summary: Fairbanks, Alaska, Vetter and Associates, 24 p.
Vetter, R., 1995, Joker and 88 group property summary: Vetter and Associates, 24 p.
Reporters C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)
Last report date 9/14/1998