Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Au
Ore minerals chalcopyrite; gold; magnetite; malachite; pyrite
Gangue minerals garnet

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.99
Longitude -144.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Judy prospect is on Granite Creek 1 to 1.5 miles above its junction with Slana River. It is locality 20 of Richter and Matson (1972) and locality 10 of MacKevett and Holloway (1977). The prospect was explored by Kirk Stanley who gave its location as in Granite Creek about 1.5 miles above the Slana River (written communication, 2000).

Geologic setting

Geologic description

The Judy prospect is a copper-gold skarn associated with limestone of uncertain affiliation that is intruded by quartz diorite. The prospect is an isolated occurrence exposed along Granite Creek for about 200 feet. It is masked by soil and heavy brush away from the creek and the outcrops are conspicuously stained with malachite. Pyrite and chalcopyrite are common; magnetite occurs locally in altered limestone. The prospect was drilled with shallow AX diameter core-holes; short intercepts of high-grade gold values were encountered.
Geologic map unit (-144.05222169417, 62.9896158409239)
Mineral deposit model Copper-gold skarn (Cox and Singer, 1986; model 18a)
Mineral deposit model number 18a
Alteration of deposit Contact metamorphism; formation of fine-grained garnet in limestone adjacent to quartz diorite.

Production and reserves

Workings or exploration The prospect was explored by short geophysical lines and small diameter diamond-drill core holes. The maximum depth of these holes was about 150 feet.
Indication of production None

Additional comments

The best reference to this deposit is in a review of the 'Slana Mineral Belt prospects' by Kirk Stanley,' which is included in an interoffice memo of Ahtna Minerals Corp. (written communication to Wes Nason, 2000). This memo includes color photographs of the prospect. Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.