Unnamed (near Flat Top Mountain)

Occurrence, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale C-6
Latitude 57.6253
Longitude -135.9979
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location of this occurrence is only known to be approximately near sea level on the southwest shore of Sister Lake at the north foot of Flat Top Mountain. For this record, the site is plotted 0.1 mile east of the west edge of the C-6 quadrangle, in sec. 18, T. 49 S., R. 59 E. It is location P-84 of Bittenbender and others (1999).

Geologic setting

Geologic description

Johnson and Karl (1985) map the rocks in the area of this occurrence as the Freeburn assemblage, a collage of kilometer-scale, fault-bounded, lozenge-shaped blocks of Cretaceous and Cretaceous(?) metasedimentary and metavolcanic rocks. The rocks are cut by numerous steeply-dipping, northwest-striking faults. The southeastern extensions of the faults at the Hirst (SI087) and Chichagof (SI093) mines, which control the mineralization there, are about a mile southwest of this occurrence. Bittenbender and others (1999), citing Still and Weir (1981), report that the prospect is a quartz vein in graywacke. A sample of quartz float contained 2 parts per million gold.
Geologic map unit (-135.999718297835, 57.6249336092992)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a

Production and reserves

Workings or exploration A sample of quartz float contained 2 parts per million gold.
Indication of production None

Additional comments

The occurrence is in West Chichagof-Yakobi Wilderness.

References

References

Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004