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Bear Pass

Prospect in Alaska, United States with commodities Zinc, Arsenic, Cadmium, Molybdenum
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Mineral occurrence model information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10307791
Record type Site
Current site name Bear Pass

Geographic coordinates

Geographic coordinates: -154.09196, 63.4705 (WGS84)
Relative position The Bear Pass prospect is at approximately 2,300 feet (700 m) in elevation along a north-trending ridgeline in Section 29, T. 23 S., R. 25 E., of the Kateel River Meridian. Location is known to within 100 feet (30 m).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Medfra B-3(quadrangle 1:63,360 scale)

Medfra S(quadrangle 1:100,000 scale)

Medfra C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork Kuskokwim River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Doyon, Limited(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Zinc Critical Primary
Arsenic Critical Secondary
Cadmium Secondary
Molybdenum Secondary

Comments on the commodity information

  • Gangue = Secondary carbonates

Mineral occurrence model information

Model code 224
USGS model code 32a
Deposit model name Mississippi Valley, S.E. Missouri Pb-Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Early Devonian

Nearby scientific data

(1) -154.09196, 63.4705
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Two zones of zinc-bearing, iron oxide gossan occur in areas of 150 feet by 60 feet (46 m by 18 m) and 150 feet by 40 feet (46 m by 12 m) on a prominant ridge top. Mineralization is hosted in a well-developed solution breccia of the Whirlwind Creek Formation of Dutro and Patton (1982); this is in unit 'Dda' of Andrews and Rishel (1982). Host rock is Lower Devonian based on fossil control in 'Dda' unit; age of mineralization is unknown. In both mineralized areas, gossan comprises about 5 percent of available float. A grab sample from an outcrop of solution-breccia mineralization contains 4.38 percent zinc and 100 ppm cadmium (Andrews and Rishel, 1982). Clautice and others (1993) reports grab sample assays of 2.00 percent zinc, 276 ppm arsenic, and 32 ppm molybdenum.
  • Ore Material = Iron Oxides
  • Age = Host rock is Lower Devonian based on fossil control in 'Dda' unit. The age of mineralization is unknown.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Bear Pass prospect was found by WGM Inc. and Patino Ltd. during the late 1970s while conducting base metal exploration on lands selected by Doyon Ltd. In both mineralized areas, gossan comprises about 5 percent of available float. A grab sample from an outcrop of solution breccia mineralization contains 4.38 percent zinc and 100 ppm cadmium. Clautice and others (1993) reports grab sample assays of 2.00 percent zinc, 276 ppm arsenic, and 32 ppm molybdenum.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Andrews and Rishel, 1982

General comments

Subject category Comment text
Deposit Model Name = Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type
Deposit Other Comments = See Starship (MD043), Spring Ridge (MD047), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type showings in Medfra quadrangle. The Bear Pass prospect is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting

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.