Riou Bay

The Riou Bay is a titanium and gold 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Riou Bay

Commodity

Primary: Titanium
Primary: Gold
Secondary: Chromium

Location

State: Alaska
District: Yakataga

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Rutile
Ore: Magnetite
Ore: Ilmenite
Ore: Gold
Ore: Chromite
Gangue: Zircon
Gangue: Xenotime
Gangue: Sphene
Gangue: Garnet

Comments

Comment (Workings): Workings / Exploration = Reconnaissance characterization of beach samples has been completed in this area.

Comment (Deposit): Model Name = Placer Au (Cox and Singer, 1986; model 39a - beach)

Comment (Geology): Geologic Description = Foley and others (1995) collected a beach sample at this location. Spiral concentrate from this sample contained 0.056 gram of gold per ton, 1.07 percent titamium, and 331 ppm zirconium. The heavy-mineral concentrate (12.28 weight percent of the original sample) contained 0.004 percent magnetite, 1.053 percent ilmenite, 0.092 percent garnet, 0.008 percent zircon, 0.007 percent rutile, and 11.12 percent other minerals. Thomas and Berryhill (1962) collected reconnaissance beach samples (IB004, IB006-010) from the Icy Bay area that contained trace to small amounts of magnetite, ilmenite, chromite, zircon, rutile, garnet, sphene, xenotime, and gold. The magnetic fraction of their samples contained as much as 6.2 pounds of iron and 1 pound of titanium oxide per cubic yard. The non-magnetic fraction contained as much as 6.4 pounds, but mostly less than 2 pounds, of titanium oxide per cubic yard.

Comment (Reference): Primary Reference = Foley and others, 1995

Comment (Geology): Age = Holocene.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Thomas, B.I., and Berryhill, R. V., 1962, Reconnaissance studies of Alaskan beach sands, eastern Gulf of Alaska: U.S. Bureau of Mines Report of Investigations 5986, 40 p.

Reference (Deposit): Foley, J.Y., La Berge, R.D., Grosz, A.E., Oliver, F.S., and Hirt, W.C., 1995, Onshore titanium and related heavy mineral investigations in the eastern Gulf of Alaska region, southern Alaska: U.S. Bureau of Mines Open-File Report 10-95, 125 p.

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