Brown Bear

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

Geologic information

Identification information

Deposit ID 10002651
MRDS ID A015092
Record type Site
Current site name Brown Bear
Alternate or previous names Old Harbor, Silver Queen, Barling Bay
Related records 10136529

Geographic coordinates

Geographic coordinates: -153.38854, 57.21134 (WGS84)
Relative position This prospect is located 0.3 mile north of triangulation station Love at the head of Barling Bay (Berg and Cobb, 1967, figure 15, locality 13; Cobb, 1972, MF 460, locality 5; McGee, 1972, locality 1; MacKevett and Holloway, 1977, locality 5) Site location is accurate to within 1/4 mile.

Site location context

Political divisions (FIPS codes)

Kodiak Island(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Kodiak A-5(quadrangle 1:63,360 scale)

Kodiak SW(quadrangle 1:100,000 scale)

Kodiak(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Kodiak-Afognak Islands(hydrologic unit)

Kodiak-Shelikof(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Kodiak National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary

Comments on the commodity information

  • Ore Material = sparse tetrahedrite

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Pyrite Ore
Pyrrhotite Ore
Tetrahedrite Ore
Chlorite Gangue
Quartz Gangue
Sericite Gangue

Mineral occurrence model information

Model code 274
USGS model code 36a.1
Deposit model name Low-sulfide Au-quartz vein, Chugach-type
Mark3 model number 26

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -153.38854, 57.21134

Economic information

Comments on the geologic information

  • Geologic Description = Three separate sulfide-bearing quartz veins, the Brown Bear, Old Harbor, and Silver Queen, cut Cretaceous metasedimentary rock. The Brown Bear vein, said to have been traced for several miles, strikes northeast, generally parallel to bedding. The dip is irregular and varies from 90 to 15 southeast. At one point the vein has a thickness of 15 feet. At another the vein splits into 3 bands 18 inches, 30 inches, and 6 feet in thickness. Assays of nine samples taken by Roehm ( 1936, PE 131-5) on the Brown Bear vein ranged from trace gold, trace silver over 32 inches to 0.58 ounce per ton gold and 0.30 ounce per ton silver over 12 inches. A basic dike, an aplite dike, and a porphyry dike crop out in the vicinity of the vein.? the Old Harbor vein crops out approximately 400 feet above the Brown Bear. It averages 5 feet in thickness and is said to have been traced for 3000 feet. No descriptions of the Silver Queen vein are available.
  • Age = Cretaceous or younger

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Kodiak

Comments on the workings information

  • Workings / Exploration = The Brown Bear vein in 1936 had been developed by a 42-foot adit, a 23-foot adit and several open cuts. Open cuts and pits exposed some of the other veins. Nine samples taken by Roehm (1936, PE 131-5) on the Brown Bear vein assayed from trace gold and silver over 32 inches to 0.58 ounce per ton gold and 0.30 ounce per ton silver over 12 inches.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Capps, 1937

General comments

Subject category Comment text
Deposit Model Name = Chugach-type low-sulfide gold-quartz vein (Bliss, 1992; model 36a.1), turbidite-hosted gold vein.
Deposit Other Comments = Most of the area is on land conveyed to the Koniag Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 12-OCT-1998 S.H. Pilcher 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.