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  3. Mineral Resource Data System (MRDS)

Unnamed (head of Jett Creek)

Occurrence in Alaska, United States with commodity Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mining district
  10. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10001957
MRDS ID A012796
Record type Site
Current site name Unnamed (head of Jett Creek)

Geographic coordinates

Geographic coordinates: -165.1483, 64.84958 (WGS84)
Relative position This occurrence is on the ridge crest between the headwaters of David and Jett Creeks at an elevation of 2,250 feet. This is locality 25 of Hummel (1962 [MF 248]) and locality 18 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).

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)

Nome(hydrologic unit)

Norton Sound(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Alteration

  • (Local) Development of silica-rich layers, formation of white mica, bleaching of marble (?), and oxidation.

Nearby scientific data

(1) -165.1483, 64.84958
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Hummel (1962 [MF 248]) noted this locality as an occurrence of copper-bearing minerals. It may be similar to other copper prospects in the area, such as Copper Mountain (NM054), Copper King (NM051), and Copper Creek (NM053). These are copper carbonate and copper sulfide-bearing silica-rich zones in metacarbonate rocks.? Country rocks at this locality are interlayered pelitic schist and marble structurally overlain a short distance to the south by chloritic and mafic schist (Thurston, 1985, figure 3A). These metamorphic rocks are part of the Nome Group derived from Proterozoic to early Paleozoic protoliths (Till and Dumoulin, 1994). The Nome Group underwent regional blueschist facies metamorphism in the Late Jurassic or Early Cretaceous (Sainsbury, Coleman, and Kachadoorian, 1970; Forbes and others, 1984; Thurston, 1985; Armstrong and others, 1986; Hannula and McWilliams, 1995). The blueschist facies rocks were recrystallized to greenschist facies or higher metamorphic grades in conjunction with regional extension, crustal melting, and magmatism in the mid-Cretaceous (Hudson and Arth, 1983; Miller and Hudson, 1991; Miller and others, 1992; Dumitru and others, 1995; Hannula and others, 1995; Hudson, 1994; Amato and others, 1994; Amato and Wright, 1997, 1998). Lode gold mineralization on Seward Peninsula is mostly related to the higher temperature metamorphism in the mid-Cretaceous (Apodoca, 1994; Ford, 1993 [thesis]; Ford and Snee, 1996; Goldfarb and others, 1997). The relation of this occurrence to the lode gold deposits is uncertain. A mid-Cretaceous age for the nearly stratabound copper deposits is possible. The deposits could, however, have formed in the late Proterozoic or in the early Paleozoic, synchronous with known periods of early plutonism on the Seward Peninsula.
  • Age = Late Proterozoic, early Paleozoic, or mid-Cretaceous.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Nome

Comments on the workings information

  • Workings / Exploration = Small prospecting pits may be present.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Hummel, 1962 (MF 248)

General comments

Subject category Comment text
Deposit Model Name = Carbonate-hosted, sulfide-bearing silica-rich rock.

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.