Firebear

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Hg
Other commodities Pb

Geographic location

Quadrangle map, 1:250,000-scale RM
Quadrangle map, 1:63,360-scale A-4
Latitude 61.078
Longitude -160.149
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a small knob at an elevation of about 700 feet in the NW1/4 sec. 5, T. 11 N., R. 61 W., of the Seward Meridian. It is about 1,500 feet northwest of a saddle having an elevation of 685 feet.

Geologic setting

Geologic description

This occurrence consists of an epithermal hot spring deposit containing carbonized fossil plant fragments preserved in siliceous cap rock. Grab samples of the deposit contain as much as 0.24 ppm gold, 1.8 ppm silver, 3 ppm mercury, and 380 ppm lead. The country rocks are largely Jurassic volcanic rocks (Box and others, 1993).
Geologic map unit (-160.151307042929, 61.0772665802986)
Mineral deposit model Hot spring Au-Ag? (Cox and Singer, 1986; model 25a)
Mineral deposit model number 25a?
Age of mineralization Tertiary? The preservation of a surface hot spring deposit containing plant fragments suggests that they are Tertiary in age.

Production and reserves

Workings or exploration No workings are present. Only reconnaissance surface geochemical sampling of this occurrence has been completed.
Indication of production None

Additional comments

This description is from unpublished field notes (station number 92AM25) of M.L. Miller, U.S. Geological Survey, Anchorage, Alaska.

References

MRDS Number 10308204
Reporters Travis L. Hudson and Madelyn A. Millholland
Last report date 6/10/2001