Van Horn

Prospect in Alaska, United States with commodities Copper, Molybdenum

Geologic information

Identification information

Deposit ID 10094073
MRDS ID A013121
Record type Site
Current site name Van Horn
Related records 10185984

Geographic coordinates

Geographic coordinates: -136.1121, 59.01973 (WGS84)
Relative position This prospect is located at an elevation of about 1,500 feet in Glacier Bay National Park and Preserve on the east side of Muir Inlet near Peak 2124 at the southwestern end of Van Horn Ridge. It is near the center of section 8, T. 33 S., R. 56 E. of the Copper River Meridian. It is shown as location 71 on plate III of Brew and others (1978) and location 11 on plate 1 of MacKevett and others (1971).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Primary

Alteration

  • (Local) Iron-stained altered zones.

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Hornfels
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -136.1121, 59.01973

Comments on the geologic information

  • Geologic Description = Brew and others (1978) describe the prospect as, 'Weakly mineralized iron-stained altered zones in hornfels, shale, and granodiorite. Most of the zones are along faults and are a few feet wide, not persisting along strike.' the hornfels strikes northerly and dip steeply (MacKevett and others, 1971). A composite grab sample of iron-stained shale contained 150 ppm copper and 15 ppm molybdenum (Brew and others,1978). A select sample of an iron-stained shear zone contained 100 ppm copper and 200 ppm molybdenum (MacKevett and others, 1971). The age of the mineralization is probably Cretaceous or younger based upon the Cretaceous age of the intrusive rocks (Brew and others, 1978).
  • Age = Cretaceous or younger based on the age of the associated intrusive rocks (Brew and others, 1978).

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Skagway subdistrict)

Comments on the workings information

  • Workings / Exploration = Brew and others (1978) state that 65 claims were staked on the ridge in 1965 and that a few shallow trenches and pits explore some of the mineralized zones.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013121
USGS Alaska Resource Data File ARDF SK012

Bibliographic references

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

  • Deposit

    Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

  • Deposit

    Berg, H.C., 1984, Regional geologic summary, metallogenesis, and mineral resources of southeastern Alaska: U.S. Geological Survey Open-file Report 84-572, 298 p., 1 plate, scale approx. 1:600,000.

  • Deposit

    MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1967, Mineral resources of Glacier Bay National Monument, Alaska: U. S. Geological Survey Open-File Report 151, 176 p.

Comments on the references

  • Primary Reference = Brew and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Weakly mineralized shear zone. There is little information on which to assign a model type.
Deposit Other Comments = the prospect is within Glacier Bay National Park and Preserve where exploration and development are restricted.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates