Unnamed (near Prospectors Peak)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Au
Ore minerals arsenopyrite; gold; pyrite
Gangue minerals carbonate minerals; chlorite; quartz; white mica

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale A-6
Latitude 61.2119
Longitude -146.1019
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located about 0.6 mile north of the Ramsey-Rutherford Camp in section 3, T. 8 S., R. 5 W., of the Copper River Meridian. It is probably located to within one-quarter mile and is locality 88 of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

This prospect consists of three patented lode claims (U. S. Bureau of Mines, 1980; Winkler, Miller, and others, 1981). These claims are assumed to have been staked on gold-bearing quartz veins that cut metaflysch of the Valdez Group. These veins are probably similar to others that are widespread in the southern Valdez quadrangle. Data summarized by Goldfarb and others (1997) show that gold-bearing quartz veins in the Valdez Group commonly contain pyrite, arsenopyrite, carbonate minerals, chlorite, and white mica and formed from water-rich fluids with 5 to 15 mole percent CO2 and significant amounts of CH4, N2, and H2S. The vein-forming fluid salinities were less than 8 percent, vein formation temperatures ranged from 225 to 375 degrees centigrade, and emplacement depths varied from 3 to 10 kilometers. The vein-forming fluids were produced by metamorphic devolatilization reactions. Radiometric dating indicates that the veins formed from 57 to 49 Ma (Goldfarb and others, 1997, p. 171) when deep parts of the accreted Valdez Group flysch underwent high-grade metamorphism and partial melting (Hudson, 1994).
Geologic map unit (-146.103978326296, 61.2113866192565)
Mineral deposit model Low-sulfide Au-quartz veins? (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a?
Age of mineralization Radiometric dating indicates that the gold-bearing quartz veins in the Valdez Group formed from 57 to 49 Ma (Goldfarb and others, 1997, p. 171) when deep parts of the accreted Valdez Group flysch underwent high-grade metamorphism and partial melting (Hudson, 1994).
Alteration of deposit Country rocks to gold-bearing quartz veins in Valdez Group metaflysch can be variably silicified, carbonitized, and sericitized (Goldfarb and others, 1997).

Production and reserves

Workings or exploration At least surface prospecting has occurred at this locality.
Indication of production Undetermined

References