Unnamed (overlooking headwaters of Jones River)

Occurrence in Alaska, United States with commodities Copper, Lead

Geologic information

Identification information

Deposit ID 10307873
Record type Site
Current site name Unnamed (overlooking headwaters of Jones River)

Geographic coordinates

Geographic coordinates: -153.17184, 62.46749 (WGS84)
Relative position This unnamed occurrence is located on a flattened, south-facing spur overlooking the headwaters of the Jones River; it is at an elevation of 5,200 feet (1,585 m) in the SE1/4 sec. 33, T. 28 N., R. 21 W., of the Seward Meridian. The reporter visited the site in 1984; at station nos. 84BT104 and 84BT147.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Secondary

Comments on the commodity information

  • Gangue = Carbonate

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Extensive carbonate alteration.

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Nearby scientific data

(1) -153.17184, 62.46749

Comments on the geologic information

  • Geologic Description = This unnamed occurrence consists of a mineralized quartz-carbonate breccia zone in a small composite pluton of Late Cretaceous (79 Ma) age (Solie and others, 1991). The pluton averages diorite in composition; it covers an equant, one square kilometer area, and intrudes the sandstone, siltstone, and silty limestone of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). . The deposit consists of disseminated chalcopyrite, pyrite, and a trace of galena in an intrusive hosted, quartz-carbonate breccia. Total sulfides amount to no more than 1 percent of the total mineralized zone. No surface measurements of the mineralized area are available. No assay data is available. Metallic content is based on field identification of sulfide minerals.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The reporter examined the site in 1984. No assay data is available. Metallic content is based on field identification of sulfide minerals.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG076

Bibliographic references

  • Deposit

    Solie, D.N., Bundtzen, T.K., and Gilbert, W.G., 1991, K-Ar ages of igneous rocks in the McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 160, 17 pages, one sheet, 1:250,000 scale.

  • Deposit

    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

Comments on the references

  • Primary Reference = This description

General comments

Subject category Comment text
Deposit Model Name = Polymetallic replacement(?) (Cox and Singer, 1986; model 19a).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting