Unnamed (head of American Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Zn
Other commodities As; Bi; Fe; Sb
Ore minerals goethite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale A-6
Latitude 62.05789
Longitude -158.99651
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,300 feet on a sharp, northeast-trending ridge. It is about 3.6 miles southwest of the top of Mosquito Mountain and about 0.3 mile southwest of the northeast corner of section 28, T. 23 N., R. 53 W., of the Seward meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a iron oxide gossan formed by the oxidation of undetermined sulfide minerals; the gossan is in hornfels developed in siltstone and siliceous sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Several pods of iron-oxide-rich gossan were sampled. The samples contained up to 700 parts per billion (ppb) silver, 640 parts per million (ppm) zinc, 500 ppm copper, 110 ppm antimony, 6.0 ppm bismuth, 40 ppm arsenic, and 20.00 percent iron (McGimsey and others, 1988).
Geologic map unit (-158.998890163747, 62.0571809325931)
Alteration of deposit Gossan developed.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1985 (McGimsey and others, 1988).
Indication of production None

References