West Gladiator

Occurrence in Alaska, United States with commodities Copper, Silver, Zinc

Geologic information

Identification information

Deposit ID 10002119
MRDS ID A013011
Record type Site
Current site name West Gladiator

Geographic coordinates

Geographic coordinates: -153.93265, 60.18943 (WGS84)
Relative position Locality is the top of peak 5,251, south of Copper Mountain, roughly 6 km N-NW of the mouth of Ospook Creek. This is locality 33 of Nelson and others (1985) and locality 32 of MacKevett and Holloway (1977). Sec. 11, T. 1 N., R. 27 W., of the Seward Meridian. Location is accurate within 1.6 km.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Zinc Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Pyrite Ore
Pyrrhotite Ore
Chlorite Gangue
Epidote Gangue
Quartz Gangue

Alteration

  • (Local) Chlorite and epidote in shear zones

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -153.93265, 60.18943

Comments on the geologic information

  • Geologic Description = Greenstone, metasediments and volcanic flows (?), are intruded by a Tertiary medium-grained hornblende-biotite granodiorite. The rocks are hornfelsed near intrusive contact. Fractures in the greenstone near intrusive contact contain malachite and chalcopyrite. Quartz veins containing epidote, chalcopyrite, and malachite cut intrusive rocks near contact also. One of five chip samples of greenstone assayed 910 ppm Cu and 4.3 ppm Ag. A sample from a quartz-epidote-chalcopyrite-malachite vein yielded up to 22 ppm Ag, 1.0 percent Cu, and 250 ppm Zn (Resource Associates of Alaska, 1976).??
  • Age = Tertiary 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 Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = One of five chip samples of greenstone assayed 910 ppm Cu and 4.3 ppm Ag. A sample from a quartz-epidote-chalcopyrite-malachite vein yielded up to 22 ppm Ag, 1.0 percent Cu, and 250 ppm Zn (Resource Associates of Alaska, 1976).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013011
USGS Alaska Resource Data File ARDF LC042

Bibliographic references

  • Deposit

    Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, 109 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Resource Associates of Alaska, Inc., 1976

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu ? or Polymetallic vein ? (Cox and Singer, 1986; models 17 ? or 22c ?)
Deposit Other Comments = Site is in Lake Clark National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 M.L. Miller U.S. Geological Survey
Reporter 15-JUN-1998 D.P. Bickerstaff U.S. Geological Survey