1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (south of Kwain Bay)

Occurrence in Alaska, United States with commodities Gold, Copper, Lead, Zinc
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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. Mineral occurrence model information
  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 10307691
Record type Site
Current site name Unnamed (south of Kwain Bay)

Geographic coordinates

Geographic coordinates: -131.36275, 55.07474 (WGS84)
Relative position This site represents seven occurrences: six are at sea level, 0.5-1.3 miles south of the mouth of Kwain Bay; and one is at an elevation of about 500 feet at the eastern foot of Tamgas Mountain, about 1.4 miles east-northeast of the mountain peak. The occurrences are in sections 26 and 35, T. 78 S., R. 93 E., of the Copper River Meridian. The map site is at the approximate center of the estimated half-square-mile area that contains these occurrences. The site corresponds to loc. 37a-g in Karl (1992). The location is accurate within about 0.2 mile.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-5(quadrangle 1:63,360 scale)

Ketchikan SW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ketchikan(hydrologic unit)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Annette Island Indian Reservation(American Indian Reservation)

American Indian Reservation BIA(Type of land area)

BIA(Federal land areas administered by BIA)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary
Lead Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -131.36275, 55.07474
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this site include undivided, metamorphosed Silurian and Ordovician volcanic, sedimentary, and intrusive rocks; Silurian trondhjemite that intrudes the Silurian and Ordovician assemblage; and recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt that unconformably overlie the Paleozoic rocks (Berg, 1972 [I 684]; Berg and others, 1988). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences consist of pyrite- and chalcopyrite-bearing quartz fissure veins in locally sheared, felsic to mafic metavolcanic and volcaniclastic rocks (Karl, 1992, loc. 37a-g). The presence of small amounts of galena and sphalerite is inferred from sample assays. The sulfides also occur as disseminations and seams in the volcaniclastic rocks. . A sample of pyrite[?] contained 100 ppm Pb, 300 ppm Zn, 300 ppm Cr, 200 ppm Ni, and 1000 ppm As; samples of various, sulfide-bearing country rocks contained up to 0.08 ppm Au, 2 ppm Ag, 1500 ppm Cu, 10 ppm Mo, 100 ppm Co, and 300 ppm Ni; samples of quartz veins contained up to 0.1 ppm Au, 2 ppm Ag, and 500 ppm Cu; and a soil survey conducted in the 1970s by private interests reportedly showed detectable gold (Karl, 1992, loc. 37a-g).
  • Age = Fissure veins probably are Late Cretaceous or younger.

Economic information about the deposit and operations

Development status Occurrence

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = A sample of pyrite[?] contained 100 ppm Pb, 300 ppm Zn, 300 ppm Cr, 200 ppm Ni, and 1000 ppm As; samples of various, sulfide-bearing country rocks contained up to 0.08 ppm Au, 2 ppm Ag, 1500 ppm Cu, 10 ppm Mo, 100 ppm Co, and 300 ppm Ni; samples of quartz veins contained up to 0.1 ppm Au, 2 ppm Ag, and 500 ppm Cu; and a soil survey conducted in the 1970s by private interests reportedly showed detectable gold (Karl, 1992, loc. 37a-g).

Reference information

Bibliographic references

  • Deposit

    Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,

  • Deposit

    Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

  • Deposit

    Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Comments on the references

  • Primary Reference = Karl, 1992

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUL-99 H.C. Berg U.S. Geological Survey

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.