Bay View

Past Producer in Alaska, United States with commodities Gold, Copper

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.
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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

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zone 30-40 feet wide that cuts metarhyolite, trondhjemite, and a prominent mafic dike (Brooks, 1902, p. 70; H.C. Berg, unpublished field data, 1968, 1969).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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012364
USGS Alaska Resource Data File ARDF KC121

Bibliographic references

  • Deposit

    Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.

  • Deposit

    Berg, H.C., 1973, Geology of Gravina Island Alaska: U.S. Geological Survey Bulletin 1373, 41 p.

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    Koch, R.D., and Elliott, R.L., 1978, Analyses of rock samples from Ketchikan quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 78-156-A, 162 p., 1 sheet, scale l:250,000.

  • Deposit

    Cobb, E.H., and Elliott, R.L., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1053, 154 p.

  • Deposit

    Berg, H.C., 1982, The Alaska Mineral Resource Assessment Program; guide to information about the geology and mineral resources of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Circular 855, 24 p.

  • 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

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

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