Bay View

The Bay View is a gold and copper mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Bay View

Commodity

Primary: Gold
Primary: Copper

Location

State: Alaska
District: Ketchikan

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Probably local silicification, carbonatization, pyritization, and introduction of hydrothermal hematite.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Hematite
Ore: Chalcopyrite
Ore: Bornite
Ore: Sphalerite
Ore: Pyrite
Gangue: Quartz
Gangue: Calcite

Comments

Comment (Reference): Primary Reference = Brooks, 1902; Cobb and Elliott, 1980; Maas and others, 1995

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zone 30-40 feet wide that cuts metarhyolite, trondhjemite, and a prominent mafic dike (Brooks, 1902, p. 70; H.C. Berg, unpublished field data, 1968, 1969).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

Comment (Workings): 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]).

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

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

Comment (Geology): Age = Late Triassic or younger.

References

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

Reference (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.

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

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