Gold-Quartz

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Other commodities Asbestos
Ore minerals chalcopyrite; galena; gold; pyrite; sphalerite
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale C-1
Latitude 62.736
Longitude -144.008
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Gold-Quartz prospect (Cobb, 1979 [ OF 79-1247]) is in Ahtell Creek. about one mile below the junction of Silver Creek. It is in NE1/4 section 13, T. 11 N., R. 7 E., Copper River Meridian. The location of the prospect is shown correctly as location 9 in Richter (1966). It is shown incorrectly as number 13 in Richter and Matson (1972), and is approximately located as number 12 of MacKevett and Holloway (1977). The location given here is accurate within 500 feet.

Geologic setting

Geologic description

A quartz-carbonate vein occurs in Pennsylvanian volcanic rocks that trends N5-8W and dips 67 West. It occurs between a hanging wall of serpentinized basalt or gabbro with chrysotile-calcite veinlets, and a footwall of tuff(?). Both walls of the vein are brecciated and iron stained. Slickensides and clay gouge with fragments of vein material indicate post-mineralization movement. The vein varies from 3 to 5 feet thick and is composed of locally brecciated, milky quartz with pods of ankerite; sphalerite, and smaller amounts of chalcopyrite, galena, pyrite and precious metals. Samples of vein assayed up to 0.9 ounce of gold per ton and 0.76 ounce of silver per ton, (Richter, 1964, 1966). The volcanic host rocks are part of Pennsylvanian and Permian, Slana Spur Formation. The description is summarized from Richter, 1964, 1966; Cobb, 1979 [OF 79-1247]; and Nokleberg and others, 1994.
Geologic map unit (-144.010183337134, 62.7356097475589)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.

Production and reserves

Workings or exploration An adit driven on the vein in 1955 and 1956 encountered glacial material 55 feet from the portal.
Indication of production None

References

MRDS Number A011843

References

Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (U.S. Geological Survey)
Last report date 12/4/2000