Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Hg
Ore minerals pyrite
Gangue minerals epidote; chlorite; quartz

Geographic location

Quadrangle map, 1:250,000-scale FP
Quadrangle map, 1:63,360-scale D-5
Latitude 54.845
Longitude -163.37639
Nearby scientific data Find additional scientific data near this location
Location and accuracy Southeast of village of False Pass on the Alaska Peninsula side of Isanotski Strait, just south of Nichol Point. Latitude and longitude are accurate; however, vein system is at least 1 km wide across strike and extends south of location given here.

Geologic setting

Geologic description

Well-developed, vertically oriented reticulated quartz vein system cutting mildly altered volcanic flows, rubble, breccia, and tuffaceous breccia. Zone extends more than 1 km across strike, veins are concentrated at northern end of zone. Sulfides are generally not apparent, though some areas have structures (vugs) indicating the removal of pyrite by weathering.
Geologic map unit (-163.378379265981, 54.8441116635725)
Mineral deposit model Epithermal gold vein
Mineral deposit model number 25
Alteration of deposit Mild propylitic alteration.

Production and reserves

Workings or exploration Zone discovered in 1990 by F.H. Wilson and G.D. DuBois during USGS reconnaissance field work. Sampling conducted in 1990, 1991, and 1992 indicates that a number of the veins are gold-bearing, having assay values up to 42 ppb Au and 1.9 ppm Ag.
Indication of production None

Additional comments

No color anomaly; this occurrence does not have an unusual appearance with respect to the local country rock.


MRDS Number A106111
Reporters F.H. Wilson
Last report date 10/28/1992