Unnamed (near the east side of terminus of glacier at head of the West Fork Chistochina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Zn
Other commodities Pb
Ore minerals galena; pyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.187
Longitude -144.9608
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about one-third mile southeast of the 1966 terminus of the glacier at the head of the West Fork Chistochina River (see figure 2 of Rose, 1967). It is about 0.6 mile northeast of the center of section 13, T. 20 S., R. 14 E., Fairbanks Meridian, and the location is accurate for the approximate center of a mineralized area.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are mainly andesite, notably pyritized (Rose, 1967). Rose mapped these rocks as Chisna Formation of Pennsylvanian to Permian age, but more recently they have been considered to be Tetelna Volcanics or Slana Spur Formation (Richter and Dutro, 1975).
The area is not mapped in detail, but Rose (1967) showed two masses of pyritized rock north of a large stock of quartz monzonite and granodiorite. Two stream-sediment samples collected below the pyritized volcanic rocks are markedly anomalous in zinc (620 and 630 parts per million [ppm]), and moderately anomalous in lead (70 and 105 ppm) and have at least background amounts of copper (Rose, 1967).
Geologic map unit (-144.963024034435, 63.1865999158504)
Age of mineralization Possibly related to the Pennsylvanian to Permian volcanic rocks or to emplacement of a nearby Mesozoic quartz monzonite pluton.
Alteration of deposit Pyritic.

Production and reserves

Workings or exploration There are no reported workings.
Indication of production None

References