Unnamed (southeast of Fords Terror) (ARDF #SD055)

Unnamed (southeast of Fords Terror)

Occurrence, Inactive

Commodities and mineralogy

Other commodities	As; Be; Cu; Pb; W
Ore minerals	chalcopyrite; galena; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale	SD
Quadrangle map, 1:63,360-scale	C-4
Latitude	57.60007
Longitude	-133.12024
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This occurrence is about 2.4 miles east-southeast of the center of the mouth of Ford Terror and about 0.5 mile south of the center of section 19, T. 49 S., R. 77 E., of the Copper River Meridian.

Geologic setting

Geologic description A stream-sediment sample at this site contained 1,000 parts per million (ppm) tungsten, 2,000 ppm arsenic, and 30 ppm beryllium (Kimble and others, 1984). A search for the source of this anomaly was unsuccessful other than that a float sample collected nearby contained traces of galena, pyrrhotite, and chalcopyrite. The site is at or near the contact between Cretaceous biotite schist and Tertiary or Cretaceous tonalite (Brew and Grybeck, 1984).
Geologic map unit	(-133.12193858895, 57.5997343299991)

Geologic description

A stream-sediment sample at this site contained 1,000 parts per million (ppm) tungsten, 2,000 ppm arsenic, and 30 ppm beryllium (Kimble and others, 1984). A search for the source of this anomaly was unsuccessful other than that a float sample collected nearby contained traces of galena, pyrrhotite, and chalcopyrite. The site is at or near the contact between Cretaceous biotite schist and Tertiary or Cretaceous tonalite (Brew and Grybeck, 1984).

Geologic map unit

(-133.12193858895, 57.5997343299991)

Production and reserves

Indication of production	None

References

References Brew, D.A., and Grybeck, Donald, 1984, Geology of the Tracy Arm-Fords Terror wilderness study area and vicinity, Alaska, in U.S. Geological Survey and U.S. Bureau of Mines, Mineral resources of the Tracy Arm-Fords Terror wilderness study area and vicinity, Alaska: U.S. Geological Survey Bulletin, 1525, p. 19-52. Kimble, A.L., Still, J.C., and Rataj, J.L., 1984, Mineral deposits and occurrences in the Tracy Arm-Fords Terror wilderness study area and vicinity, Alaska, in U.S. Geological Survey and U.S. Bureau of Mines, Mineral resources of the Tracy Arm-Fords Terror wilderness study area and vicinity, Alaska: U.S. Geological Survey Bulletin 1525, p. 105-210. U.S. Geological Survey and U.S. Bureau of Mines, 1984, Mineral resources of the Tracy Arm-Fords Terror wilderness study area and vicinity, Alaska: U.S. Geological Survey Bulletin 1525, 308 p.
Reporters	Donald Grybeck (U.S. Geological Survey)
Last report date	10/8/2004