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Unnamed (on southern Chilkat Peninsula)

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Zinc, Arsenic, Lead, Tungsten
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308235
Record type Site
Current site name Unnamed (on southern Chilkat Peninsula)

Geographic coordinates

Geographic coordinates: -135.32208, 59.11975 (WGS84)
Relative position This occurrence is at the head of a small bay on the eastern shore of the Chilkat Peninsula about 2.3 miles north of its southern tip. It is about 0.9 miles, S60E from VABM 1450 'Kal'. It is shown as number 41 on sheet 1 of Still and others (1991).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway A-1 SW(quadrangle 1:24,000 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chilkat-Skagway Rivers(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Zinc Critical Primary
Arsenic Critical Secondary
Lead Secondary
Tungsten Critical Secondary

Materials information

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

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Late Triassic

Nearby scientific data

(1) -135.32208, 59.11975
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Still and others (1991) indicate that this occurrence is located in metabasalt along a north-northwest-striking lineament that is likely a splay off the fault that runs through Flat Bay. Brecciated sphalerite-bearing basalt boulders up to 1 foot by 2 foot in size contained up to 6.23 ppm gold, 13 ppm silver, 27% zinc, 2,600 ppm copper, 13 ppm tungsten, and 50 ppm arsenic. Iron-stained metabasalt rubble crop with chalcopyrite, pyrite, and malachite in a quartz knot contained 0.446 ppm gold, 220 ppm zinc, and 8,400 ppm copper. A stream sediment sample 0.8 miles north of this site and along the same lineament contained 0.024 ppm gold, 1.5 ppm silver, 3,000 ppm zinc, 1,150 ppm copper, and 590 ppm lead. Plafker, Hudson, and Silberling (1979) and Plafker and Hudson (1980) note that metabasalts on the Chilkat Peninsula are vesicular and/or amygdaloidal and that well-developed pillow textures are locally present. Based in part on fossil evidence that supports a Late Triassic (Karnian) age, they suggest that the metavolcanics and carbonates may correlate with similar rocks of the Wrangellia terrane. The age of the mineralization is not well established, but can be no older than the Late Triassic age of the host rocks. If the structure that localizes the mineralization is related to the nearby Chilkat Fault, then the age of the mineralization is probably Tertiary or younger as most movement on the Chilkat Fault has been post-Mesozoic (Lanphere, 1978).
  • Age = the age of this occurrence is not well established, but can be no older than the Late Triassic age of the host rocks (Plafker, Hudson and Silberling, 1979; Plafker and Hudson, 1980). If the structure that localize the mineralization is related to the Chatham Strait Fault, then the age of the mineralization is probably Tertiary or younger as most movement on the Chilkat Fault has been post-Mesozoic (Lanphere, 1978).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Still and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Base and precious metal mineralization localized along a lineament (shear zone?) in metabasalt. The metals have probably been derived from the host metabasalts.
Deposit Other Comments = This occurrence is within the Chilkat State Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-01 T.C. Crafford T. Crafford & Associates

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.