Unnamed (near Raft Creek)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000723
MRDS ID A011362
Record type Site
Current site name Unnamed (near Raft Creek)

Geographic coordinates

Geographic coordinates: -147.27275, 63.06963 (WGS84)
Relative position This occurrence is at an elevation of about 3,900 feet, on of the first northwest tributary to Raft Creek. The map site is about 1.2 mile north of the Denali Highway, near the center of sec. 25, T. 21 S., R. 2 E., of the Fairbanks Meridian. This location is shown in Smith (1981).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Pyrite Ore
Quartz Gangue

Alteration

  • (Local) Local oxidation and copper minerals.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -147.27275, 63.06963

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the occurrence are mostly the Nikolai Greenstone, a thick sequence of Middle or upper Triassic basalt and subordinate tuff, argillite, and chert (Nokleberg and others, 1992). At the occurence, a small diorite pluton intrudes the Nikolai Greenstone. The deposit consists of chalcopyrite, pyrite, and malachite erratically distributed in quartz veins 1/4 to 3 inches wide. The veins occur along a shear zone several feet wide that cuts the diorite pluton.
  • Age = Middle Triassic or younger.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Valdez Creek

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011362
USGS Alaska Resource Data File ARDF HE189

Bibliographic references

  • Deposit

    Smith, T.E., 1981, Geology of the Clearwater Mountains, south-central Alaska: Alaska Division of Geological "&" Geophysical Surveys Geologic Report 60, 72 p., 3 sheets, scale 1:63,360.

  • Deposit

    Nokleberg, W.J., and others, 1992, Circum-North Pacific terrane map, in Tracy, K.V., Anker, E. M., Ryan, C., Hoffman, V. , eds., International conference on Arctic margins, p. 44.

Comments on the references

  • Primary Reference = Smith, 1981

General comments

Subject category Comment text
Deposit Model Name = Quartz vein in shear zone.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-2000 D.L. Stevens Stevens Exploration Management Corporation