Unnamed (on the west side of Tarr Inlet)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Zinc, Gold

Geologic information

Identification information

Deposit ID 10002214
MRDS ID A013115
Record type Site
Current site name Unnamed (on the west side of Tarr Inlet)
Related records 10136918

Geographic coordinates

Geographic coordinates: -137.01213, 59.00972 (WGS84)
Relative position This occurrence is in the Glacier Bay National Park and Preserve on the west side of Tarr Inlet about 4.5 miles southeast of the Canadian border. It is on a knob, informally known as 'Tarr Inlet Knob', that reaches a height of about 600 feet. It is shown as number 6 on figure C-2 and in figure C-39 of Brew and others (1978) and as location 17 on Plate 1 of MacKevett and others (1971). A less accurate location of this occurrence, which places it about 3/4 mile farther to the northwest, is shown as number 2 by Cobb (1972 [MF-424]).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Zinc Primary
Gold Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Alteration is mentioned but not described in Brew and others (1978).

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Cretaceous

Nearby scientific data

(1) -137.01213, 59.00972

Comments on the geologic information

  • Geologic Description = The following description is summarized from Brew and others, 1978. Mineralization is found along altered fault and shear zones in quartz monzodiorite that makes up the Tarr Inlet Knob. The quartz monzodiorite contains large xenoliths of shale and volcanics. Porphyritic granite, probably in the form of small plugs, occurs at two sites on the knob. The altered and mineralized fault and shear zones are up to 200 feet thick and are often brightly iron-stained. Most of the mineralization occurs along altered fault zones that are oriented N20-30W and N10-30E. The deposit consists of pyrite, chalcopyrite, sphalerite, arsenopyrite, and quartz. The prospect is generally similar to the Margerie (SK020) prospect located about 2.5 miles to the west and both may have been mineralized by the same process. Most of the more significant mineralization has been found on the east side of the Tarr Inlet Knob below the 500-foot elevation. Samples of the richer portions of the mineralized zone that vary from 3 feet to 16 feet wide contain up to 3,300 ppm copper, 5,000 ppm zinc, 3,100 ppm lead, 50 ppm silver, and 0.15 ppm gold. A 1/2-foot sample contained 0.48% copper, 4.3% zinc, 100 ppm silver, 1,500 ppm lead, and 0.15 ppm gold.? the Tarr Inlet Knob is in the Geikie province of Brew and others (1978) near its western margin. It is along the Brady Glacier fault zone, the eastern edge of the Tarr Inlet suture zone, which forms the western boundary of the Geike province. Movement along these structures is probably responsible for the fault and shear zones which localize the mineralization at this site. The faulting and mineralization must be younger than the Cretaceous intrusive rocks at Tarr Inlet Knob.
  • Age = The mineralization must be younger than the Cretaceous age of the host intrusive rocks (Brew and others, 1978).
  • Age = Host rock is Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau (Glacier Bay subdistrict)

Comments on the reserve resource information

  • Reserves = Brew and others (1978) judged the mineralized zones to be too small and too low-grade to be economic.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013115
USGS Alaska Resource Data File ARDF SK019

Bibliographic references

  • Deposit

    Wright, F.E. and Wright, C.W., 1937, The Glacier Bay National Monument in southeastern Alaska, its glaciers and geology: U.S. Geological Survey manuscript report, 224 p.

  • 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

    Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, 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

    Cobb, E.H., 1981, Summaries of data and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska, Supplement to Open-File Report 78-316, Part A in Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-A, 11 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

    Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section B, Glacier Bay subarea: U.S. Bureau of Mines of Mines Special Publication, 69 p.

  • Deposit

    Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska; Supplement to Open-File Report 78-316; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-A, 11 p.

  • 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 = Mineralized veins and shear zones in a quartz monzodiorite, possibly a porphyry copper occurrence (Cox and Singer, 1986: model 17?).
Deposit Other Comments = the deposit is within Glacier Bay National Park and Preserve where exploration and development is restricted.

Reporter information

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