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  3. Mineral Resource Data System (MRDS)

Unnamed (near Driest Point)

Occurrence in Alaska, United States with commodities Silver, Lead, Zinc, Barium-Barite
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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. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10001612
MRDS ID A012376
Record type Site
Current site name Unnamed (near Driest Point)

Geographic coordinates

Geographic coordinates: -131.60676, 55.17668 (WGS84)
Relative position This site represents 3 occurrences along about 0.3 mile of shoreline at and near Driest Point (section 19, T. 77 S., R. 92 E., of the Copper River Meridian). The map site is at Driest Point and is accurate within 0.1 mile. The site corresponds to loc. 15 in Berg (1972 [I 684]), loc. 134 in Elliott and others (1978), and loc. 22a-c in Karl (1992).

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-5 NW(quadrangle 1:24,000 scale)

Ketchikan SW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Federal lands

Annette Island Indian Reservation(American Indian Reservation)

American Indian Reservation UND(Type of land area)

UND(Federal land areas administered by UND)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Critical Primary
Barium-Barite Critical Secondary

Materials information

Materials Type of material
Barite Ore
Galena Ore
Pyrite Ore
Calcite Gangue
Quartz Gangue

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -131.60676, 55.17668
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks at this site consist of sheared, recrystallized, Upper Triassic carbonate and clastic rocks, rhyolite, and basalt; and of diorite dikes that intrude the Triassic strata (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the mineral occurrences are quartz-calcite-barite-galena fissure veins up to 6 feet thick in sheared, rhyolite-clast conglomerate Berg, 1992; Karl, 1992). Quartz-calcite veins also cut pyritic diorite dikes that intrude the bedded rocks. Samples of variously mineralized bedded rocks contained up to 1.5 ppm Ag, 150 ppm Pb, 200 ppm Zn, and 5000 ppm Ba; a sample of the diorite contained 100 ppm Co, 700 ppm Cr, and 150 ppm Ni; and samples of mineralized rhyolite contained up to 0.7 ppm Ag (Karl, 1992, loc. 22a-c). ? the fissure veins are probably Late Cretaceous or younger, assuming that they formed during, or following, the regional metamorphism.
  • Age = The fissure veins are probably Late Cretaceous or younger in age, assuming that they formed during, or following, the regional metamorphism.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Reference information

Bibliographic references

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 06-JUL-1999 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.