Unnamed (west flank of Takotna Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities As; Cr; Hg
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-1
Latitude 62.93419
Longitude -156.05877
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is near upper Beef Steak Creek at an elevation of about 1,300 feet. It is about 1.5 mile west to north-northwest of the top of Takotna Mountain in the SW1/4, section 23, T. 33 N., R. 36 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are part of the Takotna pluton which has been dated as 71.0 Ma; the pluton intrudes shale and sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). Iron-oxide-stained hornfelsed sandstone contains minor disseminated pyrite and is cut by quartz veinlets. Samples contained up to 1,000 parts per million (ppm) chromium, 300 parts per billion (ppb) silver, 1.1 ppm mercury, and 30 ppm arsenic (Bundtzen and Laird, 1983; McGimsey and others, 1988; Miller, Bundtzen, and Gray, 2005).
Geologic map unit (-156.061129486433, 62.9335597828639)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Probably Late Cretaceous, based on its host rock, the Takotna pluton that has been dated at 71.0 Ma (Miller and Bundtzen, 1994).
Alteration of deposit Iron oxides produced by the weathering of pyrite and other (?) sulfides.

Production and reserves

Workings or exploration Surface sampling was conducted by the Alaska Division of Geological and Geophysical Surveys in in 1978 and by the U.S. Geological Survey in 1985 (Bundtzen and Laird, 1983; McGimsey and others, 1985).
Indication of production None

References