Unnamed (Burroughs Bay )

The Unnamed (Burroughs Bay ) is a molybdenum 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: Unnamed (Burroughs Bay )

Commodity

Primary: Molybdenum
Secondary: Uranium

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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Mo, low-F

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Pyritization and silicification.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Molybdenite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Deposit): Other Comments = Also see Quartz Hill (KC105).

Comment (Deposit): Model Name = Porphyry molybdenum, low-F (Cox and Singer, 1986; model 21b)

Comment (Reference): Primary Reference = Berg and others, 1978 (OFR 78-73M); Koch and Elliott, 1978 (OFR 78-156A)

Comment (Geology): Geologic Description = The country rocks in the area of this prospect include a Cretaceous foliated quartz diorite batholith; metamorphic roof pendants in the batholith; and a Miocene granite and quartz porphyry stock and associated dikes that intrude the batholith and the metamorphic rocks (Berg and others, 1978, p. 12-13; Berg and others, 1988, p. 23). The outcrop area of the stock and associated dikes is about a square mile. The deposit is in the Miocene granite and quartz porphyry and consists of molybdenite-bearing quartz fissure veins and molybdenite coatings on fracture surfaces, and of veins and disseminations of pyrite (Berg and others, 1978, p. 12-13 and table 2). Analyses of several samples of molybdenite-bearing quartz porphyry dikes showed up to 100 ppm Mo and traces of U (Koch and Elliott, 1978 [OFR 78-156A]). The mineralogy, hostrock, age, and setting indicate that this is a porphyry molybdenum deposit similar in type and origin to the much larger one at Quartz Hill (KC105).

Comment (Geology): Age = Miocene.

Comment (Workings): Workings / Exploration = The deposit has been examined by private interests, but none of their findings have been made public. A grade of 0.06% molybdenite has been reported (Eakins and others, 1983, p. 46).

References

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): 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., Elliott, R.L., and Koch, R.D., 1978, Map and tables describing areas of metalliferous mineral resource potential in the Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-73-M, 52 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Eakins, G.R., Bundtzen, T.K., Robinson, M.S., Clough, J.G., Green, C.B., Clautice, K.H., and Albanese M.A., 1983, Alaska's mineral industry, 1982, Alaska Division of Geological and Geophysical Surveys Special Report 31, 63 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.

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