Unnamed (near Towers Arm) (ARDF #PE007) Cu

Unnamed (near Towers Arm)

Prospects, Probably inactive

Commodities and mineralogy

Main commodities	Cu
Ore minerals	chalcopyrite

Geographic location

Quadrangle map, 1:250,000-scale	PE
Quadrangle map, 1:63,360-scale	D-5
Latitude	56.8397
Longitude	-133.3717
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This site is approximately at the center of a large block of at least 492 claims that cover more than 30 square miles around upper Towers Arm and North Arm of Duncan Canal. It is locality 14 of Grybeck, Berg, and Karl (1984). This early ARDF record covers an area where more detailed information has subsequently become available on several sites drilled by the company who staked the block of claims. This information can be found in records PE005, PE082, PE087.

Geologic setting

Geologic description Numerous diamond drill holes were scattered widely on the claim block (which includes the Northern Copper prospect, PE005) in 1978 and 1979 by AMOCO Minerals from a camp located on the southern end of the peninsula between Towers Arm and the North Arm of Duncan Canal. The target of the exploration was massive-sulfide, base-metal deposits and the drilling was specifically directed to test airborne geophysical anomalies. Most if not nearly all of the holes did not intercept significant metal values and only chalcopyrite in minor amounts was found. The geophysical anomalies largely proved to be associated with graphitic layers (AMOCO Minerals staff, oral communication, 1979). This early ARDF record covers an area where more detailed information has become available on several sites drilled by the company who staked the block of claims. This information can be found in records PE005, PE091, and PE095. Recent mapping by Karl and others (1999) indicates that some of the area probably includes Triassic Hyd Group rocks, a unit that is commonly associated with volcanogenic massive sulfide deposits in the Duncan Canal area.
Geologic map unit	(-133.373434283763, 56.8393612870441)
Mineral deposit model	Unclear if significant mineralization was ever found.

Production and reserves

Workings or exploration	Numerous diamond drill holes were drilled widely on this claim block in 1978 and 1979 by AMOCO Minerals from a camp located on the southern end of the peninsula between Towers Arm and the North Arm of Duncan Canal. The target of the exploration was massive-sulfide, base-metal deposits and the drilling was specifically directed to test airborne geophysical anomalies. Most if not all of the holes were devoid of significant metal values and the geophysical anomalies largely proved to be associated with graphitic layers (AMOCO Minerals staff, oral communication, 1979).
Indication of production	None

Workings or exploration

Numerous diamond drill holes were drilled widely on this claim block in 1978 and 1979 by AMOCO Minerals from a camp located on the southern end of the peninsula between Towers Arm and the North Arm of Duncan Canal. The target of the exploration was massive-sulfide, base-metal deposits and the drilling was specifically directed to test airborne geophysical anomalies. Most if not all of the holes were devoid of significant metal values and the geophysical anomalies largely proved to be associated with graphitic layers (AMOCO Minerals staff, oral communication, 1979).

Indication of production

None

References

References Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000. Karl, S.W., Haeussler, P.J., and McCafferty, A.E., 1999, Reconnaissance geologic map of the Duncan Canal-Zarembo Island area, southeastern Alaska: U.S. Geological Survey Open-File Report 99-0168, 30 p., 1 sheet, scale 1:150,000.
Reporters	D.J. Grybeck (Port Ludlow, WA)
Last report date	4/8/2007