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  3. Mineral Resource Data System (MRDS)

Riou Bay

Occurrence in Alaska, United States with commodities Gold, Titanium, Chromium
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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. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307628
Record type Site
Current site name Riou Bay

Geographic coordinates

Geographic coordinates: -141.46363, 59.90756 (WGS84)
Relative position This occurrence is on the east shoreline of Point Riou Spit, on the west side of Riou Bay. It is in the SW1/4 section 22, T. 23 S., R. 23 E., of the Copper River Meridan. This is sample location 154 of Foley and others (1995).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Icy Bay D-2 and D-3(quadrangle 1:63,360 scale)

Icy Bay(quadrangle 1:100,000 scale)

Icy Bay(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Dezadeash River(hydrologic unit)

Gulf of Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach Alaska Corporation(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Titanium Critical Primary
Chromium Critical Secondary

Materials information

Materials Type of material
Chromite Ore
Gold Ore
Ilmenite Ore
Magnetite Ore
Rutile Ore
Garnet Gangue
Sphene Gangue
Xenotime Gangue
Zircon Gangue

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) Qs
ListMap

Economic information

Comments on the geologic information

  • 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.
  • Age = Holocene.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Yakataga

Comments on the workings information

  • Workings / Exploration = Reconnaissance characterization of beach samples has been completed in this area.

Reference information

Bibliographic references

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Foley and others, 1995

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 12-DEC-01 Travis L. Hudson Applied Geology

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.