Unnamed (south of the peak of Chitsia Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Mo; Sb
Ore minerals chalcopyrite; pyrite; stibnite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale D-1
Latitude 63.9596
Longitude -150.2948
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 2500 feet south of the peak of Chitsia Mountain. The location is taken from Bundtzen, Smith, and Tosdal's (1976, pl. 2) reconnaissance map and is probably accurate within 1000 feet. The occurrence correponds to number 76 of Bundtzen, Smith, and Tosdal (1976) and 85b of Bundtzen (1981).

Geologic setting

Geologic description

The country rock in the area of this occurrence consists of phyllite and metarhyolite of the Upper Devonian and Mississippian Totatlanika Formation (Hawley and Associates, 1978, fig. 4.1-A(3); Bundtzen, 1981). The deposit is a vein that strikes NNW and is nearly vertical. It contains quartz, calcite, pyrite, some chalcopyrite, and, possibly, stibnite. Grab samples assayed up to 0.09 ounce of gold per ton, 0.96 ounce of silver per ton, 0.45 percent antimony, 100 ppm molybdenum, and 400 ppm each of copper, lead, and zinc (Bundtzen, 1981, occurrence 85a, table 10). The age and affiliation of the vein is uncertain. Elevated molybdenum is characteristic of deposits in Totatlanika metarhyolite (Bundtzen, 1981).
Geologic map unit (-150.297129777783, 63.9591108310395)
Mineral deposit model Low-sulfide Au?-quartz vein (Cox and Singer, 1986; model 36a?).
Mineral deposit model number 36a?
Age of mineralization Uncertain: possibly Late Devonian or Mississippian (Bundtzen, 1981), or Eocene (see record MM091).

Production and reserves

Workings or exploration The area has been reconnaissance mapped and sampled (Bundtzen, Smith, and Tosdal, 1976; Hawley and Associates, 1978). There are no significant workings.
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve.

References