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  3. Alaska Resource Data File (ARDF)

Unnamed (near Coning Point)

Occurrence, Probably inactive

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Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; sphalerite
Gangue minerals calcite

Geographic location

Quadrangle map, 1:250,000-scale DE
Quadrangle map, 1:63,360-scale D-2
Latitude 54.8463
Longitude -132.6446
Nearby scientific data Find additional scientific data near this location
Location and accuracy Maas and others (1991) describe this occurrence as a large, sulfide-bearing marble boulder near a rock pit about a mile north-northwest of Coning Point. The source of the boulder has not been found but similar marble is nearby. The boulder is about at the center of section 13, T. 81 S., R. 85 E. Hedderly-Smith (1999) describes a 4-inch-thick quartz-sulfide vein nearby.

Geologic setting

Geologic description

This occurrence consists of a chalcopyrite-, galena-, sphalerite-, and silver-bearing marble boulder (Maas and others, 1991). A sample contained 20.4 parts per million silver, 0.92 percent copper, 0.60 percent lead, and 5.0 percent zinc. The source of the boulder is not known, but Gehrels (1991) maps a large area of pre-Ordovician marble just to the north.
Hedderly-Smith (1999) describes a 4-inch-thick quartz-sulfide vein nearby that crosscuts siliceous chlorite schist. Two chip samples contained 1.50 and 0.81 percent copper, 0.84 and 1.90 percent lead, 9.92 and 7.52 percent zinc, 0.92 and 1.79 ounces of silver per ton, and less than 0.002 and 0.006 ounce of gold per ton.
Geologic map unit (-132.646265026906, 54.8459553722526)
Mineral deposit model Base metals and silver in pre-Ordovician marble.

Production and reserves

Workings or exploration None, other than sampling by industry and government geologists.
Indication of production None

Additional comments

The subsurface rights to the land in the vicinity are held by the Sealaska Corporation.

References

References

Gehrels, G. E., 1991, Geologic map of Long Island and southern and central Dall Island, southeastern Alaska: U.S. Geological Survey Map MF-2146, 1 sheet, scale 1:63,360.
Hedderly-Smith, D.A., 1999, Inventory of metallic mineral prospects, showings and anomalies on Sealaska lands, 1988 through 1998: Sealaska Corporation, Juneau, Alaska, 217 p. (internal report held by Sealaska Corporation, Juneau, Alaska).
Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.
Maas, K.M., Still, J.C., Clough, A.H., and Oliver, L.K., 1991, Mineral investigations in the Ketchikan mining district, Alaska, 1990: southern Prince of Wales Island and vicinity: U.S. Bureau of Mines Open-File Report 33-91, 139 p., 12 sheets, scale 1:63,360.
Reporters D.J. Grybeck (Applied Geology)
Last report date 9/1/2003