1. Mineral Resources
  2. Online Spatial Data
  3. Alaska Resource Data File (ARDF)

Unnamed (west of Tukgahgo Mountain)

Occurrence, Inactive

Map
KML
XML
GeoJSON

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SK
Quadrangle map, 1:63,360-scale B-2
Latitude 59.3
Longitude -135.68
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,500 feet, 1.7 miles west of the summit of Tukgahgo Mountain. It is in the south-central part of section 5, T. 30 S., R. 57 E. of the Copper River Meridian. It is shown as mineral occurrence 7 on sheet 1 of Redman and others (1984) and as number S048 by Wells and others (1986).

Geologic setting

Geologic description

Redman and others (1984) describe this occurrence as a series of chalcopyrite-bearing quartz veins that cut a diorite dike in metabasalt. The veins are 1 to 10 inches thick and at least 35 feet long. A representative sample contained 520 ppm copper and 0.3 ppm silver. The diorite dike is probably the same age as the nearby mid-Cretaceous, Mount Kashagnak pluton.
Geologic map unit (-135.681834499125, 59.2996719256207)
Mineral deposit model Quartz sulfide veins (Cox and Singer, 1986; model 22c or 36a).
Mineral deposit model number 22c or 36a
Age of mineralization Mid-Cretaceous or younger based on the age of the dike cut by the veins (Redman and others, 1984).

Production and reserves

Indication of production None

References

MRDS Number A013104

References

Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.
Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters T.C. Crafford (T. Crafford & Associates, Anchorage)
Last report date 2/4/2001