Unnamed (north of upper South Fork, Otter Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities As; Hg
Ore minerals iron oxide
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-4
Latitude 62.54873
Longitude -157.60098
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,700 feet in a saddle on an irregular-shaped ridge between the head of the Dishna River and the head of the North Fork of Otter Creek. The prospect is about 1.1 mile north of hill 1861 and 1.4 mile west of hill 2208 and near the center of the N1/2 section 3, T. 28 N., R. 45 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This prospect is in an area of pronounced gossan development associated with silica-carbonate-altered mafic dikes that cut sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Several prospect pits explored three pods of iron oxide gossan. The total length of gossan is about 160 feet. Grab samples of gossan contain up to 340 parts per billion (ppb) mercury, 60 parts per million (ppm) arsenic, 100 ppm copper, and a trace of silver (McGimsey and others, 1988).
Geologic map unit (-157.603363800168, 62.5480486478993)
Alteration of deposit Silica-carbonate alteration of mafic dikes.

Production and reserves

Workings or exploration Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Indication of production None

References