Unnamed (east of Yantarni Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SW
Quadrangle map, 1:63,360-scale D-4
Latitude 56.9
Longitude -157.3
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in T. 37 S., R. 50 W., of the Seward Meridian, east of Yantarni Creek (MacKevett and Holloway, 1977, locality 5). Site location is accurate to within 2 miles.

Geologic setting

Geologic description

This site is marked by a color anomaly which coincides with a diorite stock (Detterman and others, 1981; Cox and others 1981). The stock, dated at 32-40 million years, intrudes the Jurassic Naknek and the Eocene and Paleocene Tolstoi Formations (Detterman and others, 1981). The diorite is reported to be altered and to contain disseminated porphyry-type mineralization (MacKevett and Holloway, 1977). The main drainage in the area is anomalous in zinc (Cox and others, 1981). No mention is made of ore or gangue minerals.
Geologic map unit (-157.302057375091, 56.8992524735252)
Mineral deposit model Porphyry copper (Cox and Singer, 1986, model 17)
Mineral deposit model number 17
Age of mineralization Tertiary.
Alteration of deposit Color anomaly associated with diorite stock.

Production and reserves

Indication of production None

Additional comments

This site is located on land selected by the Koniag Native Corporation.