Unnamed Prospect (ARDF - HE051; south of upper Long Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - HE051; south of upper Long Creek)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: This prospect is at an elevation of 400 feet south of upper Long Creek. The site is in sec. 17, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within 1 mile. This is loc. 12 of Hawley and others (1969); loc. 35 of Hawley and Clark (1974).
Geology: The country rocks in the area of this prospect consist largely of sheared, Devonian serpentinite that forms lenticular and podiform tectonic blocks as much as several hundred meters in size. The deposit is in serpentinite, and consists of pyrite-rich pods, locally accompanied by chalcopyrite and gold-rich zones. Local high platinum, chrome, and nickel values have also been reported. Samples contain up to 0.3 ppm gold, 1,500 ppm chromium, 3,000 ppm copper, 1,500 ppm nickel, and a trace of platinum (Hawley and others, 1969).
Workings: Surface sampling only. Local high platinum, chrome, and nickel values have also been reported. Samples contain up to 0.3 ppm gold, 1,500 ppm chromium, 3,000 ppm copper, 1,500 ppm nickel, and a trace of platinum (Hawley and others, 1969).
Age: The copper and chromium minerals probably were syngenetic with their Devonian ultramafic hostrock, and may have been partly redistributed during serpentinization.
Reserves: None of the sulfide bodies appears to be of any significant size.

Commodities (Major) - Au, Cu; (Minor) - Cr, Ni, Pt
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8a)

Other Databases

Link to USGS - Alaska:	HE051

Other Regions, Features and Areas containing this locality

References