Silverdikes

Occurrence, Active

Commodities and mineralogy

Main commodities Ag
Other commodities Pb; Zn
Ore minerals galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-6
Latitude 63.21
Longitude -149.61
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Silverdikes prospect is at an elevation of about 2,900 feet, about 1.7 miles southwest of Lookout Mountain. The map site is in the SW1/4 of sec. 2, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within one mile.

Geologic setting

Geologic description

The Silverdikes prospect is on the Chulitna fault. The country rocks are Upper Jurassic to Upper Triassic crystal tuff, argillite, graywacke, and chert, cut by Upper Cretaceous or Lower Tertiary, fine-grained quartz porphyry dikes. The deposit apparently consists of galena- and sphalerite-bearing quartz veins, but their hostrock is not specified. The dikes contain disseminated pyrite. Geochemically anomalous silver, lead and zinc values are reported (unpublished report, Addwest Minerals International, Ltd, 1997). The Silverdikes prospect closely resembles the deposit at Lookout Mountain (HE032).
Geologic map unit (-149.612289905542, 63.2095264005319)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Late Cretaceous or younger.
Alteration of deposit Minor sericitic-phyllic alteration reported.

Production and reserves

Workings or exploration Surface sampling only.
Indication of production None

Additional comments

Also see Lookout Mountain (HE032).

References

MRDS Number 10307515
Reporters N. Van Wyck (Stevens Exploration Management Corporation)
Last report date 4/7/2000