Ginny Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Ag; Cu
Ore minerals chalcopyrite; galena; sphalerite
Gangue minerals pyrite; siderite

Geographic location

Quadrangle map, 1:250,000-scale MU
Quadrangle map, 1:63,360-scale B-4
Latitude 68.29
Longitude -161.3
Nearby scientific data Find additional scientific data near this location
Location and accuracy Location plotted is prospect locality of Mayfield and others (1979, pl. 1); on ridge between Kugururok River and Trail Creek, about 7 mi (11.2 km) northwest of Misheguk Mountain; located to within 1 mi (1.6 km).

Geologic setting

Geologic description

Sphalerite, galena, pyrite, and rare chalcopyrite occur mainly as minute crystals scattered throughout mineralized sandstone, which also contains considerable siderite where mineralized and none elsewhere. Thin quartz veins cut the sedimentary beds; most are barren, but sulfides occur sparsely in some of them. Rock and stream sediment samples indicate that the deposit may also contain silver, but the mineral(s) in which silver occurs has not been determined. Mineralized area is at least 1 mile long and up to 1/2 mile wide. Deposit apparently formed by hydrothermal open-space filling and replacement rather than by hot-spring deposition on sea floor; deposit is in lowest (Brooks Range) thrust sequence in area. Surface rubble is a discontinuous mixture of gossan and partly iron-stained sandstone. Sulfides are preserved only in the least weathered surface rocks. Surface leaching produces a pitted appearance on many of the limonite-rich rocks. Deposit is in region of extreme thrust faulting.
Geologic map unit (-161.302983435684, 68.2893858141303)
Mineral deposit model Sediment-hosted Pb-Zn.
Alteration of deposit Iron-staining, leaching

Production and reserves

Workings or exploration Analyzed samples contain 0.3-1% Zn and variable Pb concentrations (Mayfield and others, 1979, p. 9-17)
Indication of production None

Additional comments

See MAS/MILS Sequence number 0020190007 (USBM, 1995).

References