Pass

Prospect in Alaska, United States with commodities Copper, Lead, Silver, Molybdenum, Antimony, Zinc
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. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10094067
MRDS ID A013010
Record type Site
Current site name Pass
Related records 10282809

Geographic coordinates

Geographic coordinates: -154.47268, 60.37942 (WGS84)
Relative position About 10.8 km NW of Kijik Lake. Locality 16 of Nelson and others (1985) and locality 24 of MacKevett and Holloway (1977). Sec. 3, T. 3 N., R. 30 W., of the Seward Meridian. Locality is accurate to within 2.0 km.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark B-4(quadrangle 1:63,360 scale)

Lake Clark SE(quadrangle 1:100,000 scale)

Lake Clark C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lake Clark(hydrologic unit)

Kvichak-Port Heiden(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Lake Clark National Preserve(National Preserve)

National Preserve NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Lead Primary
Silver Secondary
Molybdenum Secondary
Antimony Critical Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Silver Ore
Chalcopyrite Ore
Galena Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Tetrahedrite Ore
Quartz Gangue

Alteration

  • (Local) Iron-staining, silicification, and propylization of the dacite.

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Dacite

Nearby scientific data

(1) -154.47268, 60.37942

Economic information

Comments on the geologic information

  • Geologic Description = Iron-staining reported to be related to stockwork-fracture filling of pyrite and (or) pyrrhotite and varying amounts of chalcopyrite, galena, and tetrahedrite (?). Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3,000 ppm Cu, 1,500 ppm Pb, and 3,600 ppm Zn. Mineralization is associated with a silicified, brecciated zone in propylitically altered dacite porphyry, possibly an explosive vent breccia, part of unit Tv (Nelson and others, 1983). Unit Tv includes rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for Unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
  • Age = Tertiary; potassium-argon ages for rocks of Unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).

Economic information about the deposit and operations

Development status Prospect
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 = Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3000 ppm Cu, 1500 ppm Pb, and 3600 ppm Zn. Eakins and others (1978) reported a Mo anomaly of 66 ppm.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Nelson and others, 1985

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu - Mo ? (Cox and Singer, 1986; model 21a ?)
Deposit Other Comments = No ore grade mineralization has been discovered (Nelson and others, 1985). 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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.