Unnamed (upper Bonanza Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Fe
Ore minerals goethite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-3
Latitude 62.51919
Longitude -157.35407
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a steep bluff overlooking the east fork of Montana Creek, about 1.8 mile south of Camelback Mountain. The occurrence is at an elevation of about 1,000 feet, about 0.2 mile northwest of the center of section 13, T. 28 N., R. 44 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a prominent, reddish-brown, goethite-rich gossan developed on pyrite-rich shale of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and others, 1988; Miller, Bundtzen, and Gray, 2005). The east-west striking gossan is at least 10 feet thick and can be traced laterally for about 320 feet. A grab sample contained only slightly anomalous silver (100 ppb), mercury (300 ppb) and iron (5.88 percent), and no other metals in anomalous concentration (Bundtzen, Laird, and Lockwood, 1988).
Geologic map unit (-157.356441124777, 62.5185046091591)
Alteration of deposit Pyrite oxidized to goethite.

Production and reserves

Workings or exploration Surface investigations were done by the Alaska Division of Geological and Geophysical Surveys in 1983 (Bundtzen and others, 1988).
Indication of production None

References