Nateekin River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale C-3
Latitude 53.85
Longitude -166.8833
Nearby scientific data Find additional scientific data near this location
Location and accuracy North side of Nateekin River about 5 miles (8 km) upstream from Nateekin Bay. Anomaly no. 18 of Christie (1974).

Geologic setting

Geologic description

A pale yellow-brown to medium red-brown color anomaly 3,000 ft (900 m) in diameter in pyroclastic rocks and volcanic flows (andesite to dacite) of Unalaska Formation (see Drewes and others, 1961). The rocks contain disseminated and locally mineralized fracture concentrated sulfides and are cut by post-mineralization augite andesite dikes. Christie (1974) indicated that there is no evidence that this sulfide system is related to an intrusive body because exposure is sufficiently good to rule out the existence of one. No copper was observed (the goal of Christie's examination efforts).
Geologic map unit (-166.885183988746, 53.8491467406462)
Age of mineralization Cenozoic
Alteration of deposit Propylitic to argillic - local silicification. Leaching is locally complete.

Production and reserves

Workings or exploration Limited reconnaissance mapping and 3 soil(?) samples. Samples contained up to 1.8 ppm silver, one contained 0.01 ppm gold and 9 ppm molybdenum.
Indication of production None

Additional comments

Localization of sulfides and silicification, the gold and silver anomalies, and the local geologic context suggests epithermal mineralization might warrant consideration.

References

MRDS Number A106012

References

Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters Damon Bickerstaff, F.H. Wilson
Last report date 5/7/1996