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Bear Gulch Placer

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

Geologic information

Identification information

Deposit ID 10003019
MRDS ID A015534
Record type Site
Current site name Bear Gulch Placer
Related records 10209321

Geographic coordinates

Geographic coordinates: -155.49476, 64.40782 (WGS84)

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ruby B-5(quadrangle 1:63,360 scale)

Ruby S(quadrangle 1:100,000 scale)

Ruby(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-405, LOC. 12. PLACER MINE MARKED ON RUBY (B-5) LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Tin Critical Tertiary

Materials information

Materials Type of material
Gold Ore
Cassiterite Unknown

Analytical data

Result FINENESS AVERAGES 857 PARTS AU AND 135 PARTS AG.

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) PzPxrqm
ListMap

Economic information

Comments on the geologic information

  • PROBABLY 2 EROSION CYCLES. CLOSEST KNOWN GRANITE BODIES ARE ABOUT 6 MILES TO THE NE AND 6 MILES TO THE SE. VALLEY NARROW. SOME GRANITIC AND QUARTZ-FLUORITE VEINS IN ACTINOLITE SCHIST, QUARTZITE SCHIST, AND GRAPHITIC SCHIST ARE KNOWN. ; MAJOR.UNITS: BEDROCK, AT LEAST IN PART, IS DEEPLY WEATHERED GREENSTONE; BEDROCK BROWN-STAINED IN PLACES AND CUT BY VEIN QUARTZ. ; REG.COM: GOLD IN BEAR GULCH DERIVED FROM THE SE; PAY STREAK ENRICHED AT MOUTHS OF TRIBUTARY GULCHES. PROBABLE LODE SOURCE ON RIDGE OR SLOPE TO EAST WHERE COVER IS THICK.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1910

Mining district

District name Ruby

Land status

Ownership category State

Comments on the workings information

  • DRIFT MINED FROM SEVERAL SHAFTS.

Comments on development

  • GOLD DISCOVERED IN 1910; MINED UNTIL ABOUT 1933. MINING WAS MAINLY BY OPEN CUTS; MORE PRODUCTIVE CLAIMS MINED ALSO BY DRIFTING.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit GOLD IN LOWER 1.5-2 MILES OF CREEK. PRINCIPAL PAY STREAK ON LOW TERRACE ON SE SIDE OF CREEK; ALSO, LOWER GRADE MINOR PAY STREAK ON HIGHER LEVEL BENCH ON SE SIDE OF CREEK. 6 CREEK CLAIMS AND ONE BENCH CLAIM HAVE BEEN PRODUCTIVE. ALLUVIUM 20-30 FT. DEEP; GRAVEL 6-8 FT. THICK; PAY STREAK 75-100 FT. WIDE. PAY STREAK CLOSELY FOLLOWS COURSE OF PRESENT STREAM. CASSITERITE NOT ABUNDANT. VERY LITTLE OR NO GRAVEL ON UPPER (TRUE) BENCH; ALLUVIUM 25 FT. THICK.
Deposit STREAM GRADIENT APPROXIMATELY 100 FT. PER MILE. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1987 Powers, M.T. (Huber, D.F.) U.S. Geological Survey

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.