1. Mineral Resources
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  3. Mineral Resource Data System (MRDS)

Unnamed (Grand Central River)

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

Geologic information

Identification information

Deposit ID 10001954
MRDS ID A012791
Record type Site
Current site name Unnamed (Grand Central River)

Geographic coordinates

Geographic coordinates: -165.18249, 64.96791 (WGS84)
Relative position This tactite occurrence is at an elevation of about 1,500 feet on a steep southwest-facing slope on the east side of the Grand Central River valley. It is close to the section line between sections 16 and 17, T. 6 S., R. 32 W., Kateel River Meridian. This is locality 35 of Hummel (1962, MF 248) and locality 15 of Cobb (1972 [MF 463]; 1978 [OFR 78-93]). The occurrence is probably located to within about 1,000 feet of the coordinates.

Site location context

Political divisions (FIPS codes)

Nome(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Nome D-1(quadrangle 1:63,360 scale)

Solomon NW(quadrangle 1:100,000 scale)

Nome(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Imuruk Basin(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tungsten Critical Primary

Comments on the commodity information

  • Gangue = Calc-silicate minerals

Materials information

Materials Type of material
Scheelite Ore

Alteration

  • (Local) Recrystallized calc-silicate assemblages are expected.

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Nearby scientific data

(1) -165.18249, 64.96791
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This is one of four tactite occurrences (this occurrence, NM035, NM041, and NM044) identifed by Hummel (1961) in the central and southern Kigluaik Mountains. The calc-silicate tactite assemblages are interpreted to have been metamorphosed along with their country rocks. Scheelite is present in all four occurrences, and galena and sphalerite accompany scheelite in one (NM044).? These occurrences are in amphibolite and upper amphibolite facies metasedimentary rocks adjacent or nearby the Thompson Creek orthogneiss (Hummel, 1962 [MF 248]; Till, 1980). The Thompson Creek orthogneiss has been determined to have a latest Proterozoic protolith (Amato and Wright, 1998). The upper amphibolite facies rocks, primarily north of the Thompson Creek orthogneiss, are probably derived from Precambrian protoliths (Sainsbury, 1972; Bunker and others, 1979; Till and Dumoulin, 1994). They are thought to have undergone regional high-pressure metamorphism along with many other rocks of Seward Peninsula in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Patrick, 1988; Patrick and Evans, 1989; Armstrong and others, 1986; Hannula and McWilliams, 1995). Higher temperature metamorphism overprinted these rocks in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Throckmorton and Hummel, 1979; Till, 1983; Evans and Patrick, 1987; Leiberman, 1988; Patrick and Leiberman, 1988; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson and Arth, 1983; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Uplift of the higher temperature metamorphic rocks took place in the mid- to Late Cretaceous and in the Eocene (Calvert, 1992; Dumitru and others, 1995).
  • Age = Late Proterozoic ; may be the same age as the Thompson Creek orthogneiss.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Nome

Comments on the workings information

  • Workings / Exploration = No workings or exploration activities are known at this locality.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Hummel, 1962 (MF 248)

General comments

Subject category Comment text
Deposit Model Name = W skarn deposit (Cox and Singer, 1986; model 14a).

Reporter information

Type Date Name Affiliation Comment
Reporter 22-OCT-99 Hawley, C.C. Hawley Resource Group
Reporter 22-OCT-99 Travis L. Hudson Hawley Resource Group

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.