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Unnamed (near Towers Arm)

Prospect in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10308037
Record type Site
Current site name Unnamed (near Towers Arm)

Geographic coordinates

Geographic coordinates: -133.3719, 56.83974 (WGS84)
Relative position Approximately the center of a large block of at least 492 claims that cover more than 30 square miles around upper Taylor Arm of Duncan Canal. Locality 14 of Grybeck, Berg, and Karl (1984); see that publication and U. S. Bureau of Mines (1980), for an outline of the claim block.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore

Nearby scientific data

(1) -133.3719, 56.83974
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Comments on the geologic information

  • Geologic Description = Numerous diamond drill holes were drilled widely on the claim block in 1978 and 1979 by AMOCO Minerals (including on the Northern Copper prospect, PE005, 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 airborne geophysical anomalies. Most if not all of the holes were devoid of significant metal values and only chalcopyrite in minor amounts was found. The geophysical anomalies largely proved to be associated with graphitic layers (oral communication, 1979, AMOCO minerals). . Brew and others (1984) mapped most of the area as undifferentiated Mesozoic rocks. However, recent mapping (Sue Karl, USGS, oral communication, 1998) suggests that some of the area probably includes Triassic Hyd Group rocks.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Probably inactive

Mining district

District name Kupreanof

Comments on the production information

  • Production Notes = None

Comments on the workings information

  • Workings / Exploration = Numerous diamond drill holes were drilled widely on the claim block in 1978 and 1979 by AMOCO Minerals (including on the Northern Copper prospect , PE005, 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 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 (oral communication, 1979, AMOCO minerals).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF PE007

Bibliographic references

  • Deposit

    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.

Comments on the references

  • Primary Reference = Grybeck, Karl, and Berg, 1984

General comments

Subject category Comment text
Deposit Model Name = Unclear if significant mineralization was ever found.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-98 H.C. Berg and D.J. Grybeck U.S. Geological Survey