Unnamed (north bank of Bonanza Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Hg
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-4
Latitude 62.35883
Longitude -157.81414
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the base of a small bluff on the north side of Bonanza Creek, about 2.5 miles northeast of the mouth of First Chance Creek. The prospect is adjacent to Bonanza Creek. The prospect is near the center of section 9, T. 26 N., R. 46 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a stockworks of quartz veinlets in a granite-porphyry sill that outcrops along the north bank of Bonanza Creek, 2.5 miles northeast of the mouth of First Chance creek. The zone of veinlets is 3-6 feet thick and and can only be seen in outcrops along the stream. Some silicification was noted in other areas of the outcrop (Bundtzen and others, 1992; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Grab samples contained up to 2,900 parts per billion (ppb) gold and 1,700 ppb mercury (McGimsey and others, 1988).
Geologic map unit (-157.816542362111, 62.3581429874051)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Silicification.

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

References

Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/24/2003