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  3. Mineral Resource Data System (MRDS)

Bay View

Past Producer in Alaska, United States with commodities Gold, Copper
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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. Alteration
  8. Mineral occurrence model information
  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 10001602
MRDS ID A012364
Record type Site
Current site name Bay View

Geographic coordinates

Geographic coordinates: -131.73066, 55.18668 (WGS84)
Relative position The Bay View mine is at an elevation of less than 100 feet, about 300 feet west of the shoreline of Seal Cove, and about 0.3 mile south-southwest of the west head of the cove. The site is in section 17, T. 77 S., R. 91 E., of the Copper River Meridian. It corresponds to loc. 118 in Elliott and others (1978), and to loc. 311-12 in Maas and others (1995). The location is accurate within a hundred feet or so.

Site location context

Political divisions (FIPS codes)

Ketchikan Gateway(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-6(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

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Hematite Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Probably local silicification, carbonatization, pyritization, and introduction of hydrothermal hematite.

Mineral occurrence model information

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

Nearby scientific data

(1) -131.73066, 55.18668
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Southern Gravina Island is underlain by an assemblage of undivided Silurian or Ordovician metamorphosed bedded and intrusive rocks; a stock and associated dikes of Silurian trondhjemite that cuts the metamorphic assemblage; and a sequence of Upper Triassic carbonate, clastic, rhyolitic, and basaltic strata that unconformably overlies the older rocks (Berg, 1973, 1982; Berg and others, 1988). The rocks are complexly folded and are cut by high-angle faults and by low-angle thrust faults. In many places, the Triassic rhyolite and the rocks beneath it are permeated by microscopic particles of hydrothermal hematite, giving them a pink, purple, or red hue (Berg, 1973, p. 14).? the Bay View deposit consists of a sulfide-bearing, quartz- and calcite-cemented, fault-breccia zone 30-40 feet wide that cuts metarhyolite, trondhjemite, and a prominent mafic dike (Brooks, 1902, p. 70; H.C. Berg, unpublished field data, 1968, 1969). The sulfide minerals include pyrite, chalcopyrite, and a little bornite and sphalerite. Brooks (1902, p. 70) describes two fault zones at this site. One strikes N30E; the other strikes about N60W and carries a foot-thick pyritic quartz vein that in the early 1900s had been explored by a 20-foot drift. Locally, quartz-calcite fissure veins in the mafic dike contain lenses of specular hematite up to several inches thick and several feet long. ? Workings at the Bay View consist of a northwest-trending adit near sea level about 300 feet west of tidewater (Maas and others, 1995, p. 227). The adit, evidently an extension of the 20-foot drift described by Brooks, is accessible for about 200-250 feet, beyond which the roof has collapsed beneath a creek, and the workings are flooded. A small smelter shipment reportedly was made in the early 1900s (Cobb and Elliott, 1980, p. 13).? Samples of the breccia zone collected by the USGS in the 1960s contained up to 10 ppm Ag, 0.10 ppm Au, 200 ppm As, more than 2% Cu, and 150 ppm Sn (Koch and Elliott, 1978 [OFR 78-156A]).? Maas and others (1995, p. 227) report that copper mineralization on southern Gravina Island generally is associated with faulting. The deposits are mainly in meta-andesite (greenschist) and trondhjemite, but also in the overlying Triassic strata. The deposits are chiefly chalcopyrite- and pyrite-bearing quartz fissure veins, but the sulfide minerals also occur as disseminations in the metavolcanic rocks, in silicified zones in the trondhjemite, and as clasts or pods in silicified or carbonatized breccia. The character and setting of the deposits suggest that they mainly are polymetallic veins of Late Triassic or younger age.
  • Age = Late Triassic or younger.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the production information

  • Production Notes = A small smelter shipment reportedly was made in the early 1900s (Cobb and Elliott, 1980, p. 13).

Comments on the workings information

  • Workings / Exploration = Workings at the Bay View consist of a northwest-trending adit near sea level about 300 feet west of tidewater (Maas and others, 1995, p. 227). The adit, evidently an extension of a 20-foot drift described by Brooks (1902. p. 70), is accessible for about 200-250 feet, beyond which the roof has collapsed beneath a creek, and the workings are flooded.? Samples of the breccia zone collected by the USGS in the 1960s contained up to 10 ppm Ag, 0.10 ppm Au, 200 ppm As, more than 2% Cu, and 150 ppm Sn (Koch and Elliott, 1978 [OFR 78-156A]).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Brooks, 1902; Cobb and Elliott, 1980; Maas and others, 1995

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 05-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.