Unnamed (northwest of upper Paint River)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Cu; Fe
Other commodities Ag
Ore minerals azurite; chalcopyrite; chrysocolla; magnetite; malachite; pyrite
Gangue minerals actinolite; calcite; epidote; garnet; quartz

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale A-5
Latitude 59.1435
Longitude -154.6392
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1,500 feet on the west valley wall of upper Paint River, about 0.8 mile northwest of the junction of Crevice Creek. The prospect is in the SE1/4 SE1/4 sec. 10, T. 12 S. R. 32 W., Seward Meridian. It corresponds to locality 1 of Richter and Herreid, 1965. The location is accurate within 500 feet.

Geologic setting

Geologic description

This prospect consists of skarn in mafic and intermediate volcanic rocks of the Jurassic Talkeetna Formation within a few hundred feet of the contact of the Jurassic Pilot Knob granodiorite (Richter and Herreid, 1965; Detterman and Reed, 1980).
The skarn mainly comprises epidote, garnet, actinolite, quartz, magnetite, and chalcopyrite, and the oxidized minerals azurite, chrysocolla, and malachite. The chalcopyrite is generally associated with actinolite and occurs in disseminations and small pods; it is accompanied by pyrite and calcite (Richter and Herreid, 1965). The most abundant ore mineral is magnetite. Richter and Herreid (1965, p. 14) described two lenses or layers of magnetite in epidote-garnet-actinolite skarn. They are as much as 25 feet thick and about 10 feet apart. The deposit is marked by a local ground-based magnetic anomaly. Richter and Herreid's locality is probably the same as Jasper's (1956, p. 9, section II), who reported magnetite float and malachite in an open cut on the steep slope above Paint River.
Geologic map unit (-154.641316735125, 59.1428098620999)
Mineral deposit model Iron skarn; possibly copper skarn (Cox and Singer, 1986, models 18d and 18b).
Mineral deposit model number 18d, 18b?
Age of mineralization Jurassic, possibly related to Pilot Knob granodiorite.
Alteration of deposit Development of garnet-epidote-calcite-actinolite skarn in calcic volcanic rocks. Oxidation of copper.

Production and reserves

Workings or exploration Exploration includes detailed geologic mapping and a ground-based magnetic survey by Richter and Herreid, (1965). There are a few prospect pits in the area.
Indication of production Undetermined

References