Unnamed (near Point Coke) (ARDF #SD012) Cu

Unnamed (near Point Coke)

Occurrence, Inactive

Commodities and mineralogy

Main commodities	Cu
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	SD
Quadrangle map, 1:63,360-scale	D-6
Latitude	57.79341
Longitude	-133.69512
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	Several claims were staked near Point Coke where Kimble and others (1984) collected a sample that contained anomalous copper. The site is about 0.5 mile east-southeast of the center of section 14, T. 47 S., R. 72 E.

Geologic setting

Geologic description At least 5 claims were staked near Point Coke from about 1900 to 1920. Their exact location is unknown but Kimble and others (1984) sampled a 240-foot thick section of schist with quartz veins and minor sulfides at this occurrence. Of the 24 samples, only one, a 2.5-foot-long channel sample across a quartz-feldspar vein has any metal content of significance: 300 ppm copper. The rocks in the area are part of the Cretaceous biotite-schist unit of Brew and Grybeck (1984).
Geologic map unit	(-133.696849533288, 57.7930742520003)
Age of mineralization	Probably Cretaceous or younger based on the age of the host rocks.

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. Redman, E.C., Maas, K.M., Kurtak, J.M., and Miller, L.D., 1991, Section D: Juneau Gold Belt subarea, in U.S. Bureau of Mines, Mineral investigations in the Juneau Mining District, Alaska, 1984-1988: Volume 2 - Detailed mine, prospect, and mineral occurrence descriptions: U.S. Bureau of Mines Special Publication VOL. 2D, 424 p., 19 sheets. 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