Unnamed Prospect (ARDF - HE064; northeast of upper Shotgun Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - HE064; northeast of upper Shotgun Creek)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: The prospect is at an elevation of about 5,000 feet on the divide about a mile northeast of upper Shotgun Creek. The map site is on the boundary of secs. 21 and 28, T. 21 S., R. 12 W., of the Fairbanks Meridian. The location is accurate to within 1 mile. This is location 36-C of Hawley and Clark (1974); locality 25 of Cobb (1978: OFR 78-1062); and locality E35 of Balen (1990: OFR 34-90).
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 prospect consists of chalcopyrite-rich sulfide bodies in the serpentinite. Chromite pods also occur in the serpentinite and platinum group elements may be present. Three samples contained 0.7 ppm silver, 0.04 to 0.06 ppm gold, 300 to 1,500 ppm chromium, 70 to 7,000 ppm copper, 100 to 1,000 ppm nickel, and a trace of platinum (Hawley and others, 1969).
Workings: Preliminary surface exploration only. Three samples contained 0.7 ppm silver, 0.04 to 0.06 ppm gold, 300 to 1,500 ppm chromium, 70 to 7,000 ppm copper, 100 to 1,000 ppm nickel, and a trace of platinum (Hawley and others, 1969).
Age: The ore minerals probably were magmatic segregations in Devonian ultramafic hostrocks, and were partly redistributed during subsequent serpentization.
Alteration: Serpentinite of ultramafic hostrocks.

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

Other Databases

Link to USGS - Alaska:	HE064

Other Regions, Features and Areas containing this locality

References