Unnamed (on Mosquito Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities As; Hg; Sb
Ore minerals iron oxide
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale A-6
Latitude 62.08341
Longitude -158.89758
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is about 0.3 mile southeast of the summit of Mosquito Mountain at an elevation of about 2,100 feet. It is at about the center of the east boundary of section 13, T. 23 N., R. 53 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a zone of heavily iron-oxide-stained altered hornfels derived from the Upper Cretaceous Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The rocks on Mosquito Mountain are a tuff-rich, clastic unit altered to hornfels that is cut by numerous intermediate sills; this suggests the presence of a nearby or buried intrusion (Miller and Bundtzen, 1994). The altered zone is of uncertain size and orientation. Grab samples of altered gossan contained up to 700 parts per billion (ppb) silver, 50 parts per million (ppm) arsenic, 38 ppm antimony, and 1,400 ppb mercury (McGimsey and others, 1988).
Geologic map unit (-158.899970963441, 62.0827054701593)
Alteration of deposit Iron oxide gossan.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Indication of production None

References