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  3. Mineral Resource Data System (MRDS)

Ophir Creek Placer

Occurrence in Alaska, United States with commodity Gold
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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. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10002576
MRDS ID A015011
Record type Site
Current site name Ophir Creek Placer
Related records 10185755

Geographic coordinates

Geographic coordinates: -156.58353, 63.08277 (WGS84)
Relative position .5-5 MILES SOUTH OF OPHIR

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ophir A-2(quadrangle 1:63,360 scale)

Ophir SE(quadrangle 1:100,000 scale)

Ophir(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • USGS MF-367, LOC. 13. TAILINGS MARKED ON OPHIR (A-2) 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

Materials information

Materials Type of material
Gold Ore
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -156.58353, 63.08277
ListMap

Economic information

Comments on the geologic information

  • MAJOR.UNITS: BEDROCK IS SLATE WITH SOME SANDSTONE. BEDROCK IS CUT BY NARROW DIKES IN PLACES.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1907
Year of first production 1908
Year of last production 1940

Mining district

District name Innoko

Comments on the workings information

  • MOST OF ALLUVIUM IS PERMANENTLY FROZEN.

Comments on development

  • MINING BY DRIFTING, HYDRAULIC PLANTS, AND HYDRAULIC SLACK-LINE SCRAPER PLANT. MOST OF CREEK MINED SECOND TIME BY MECHANICAL EQUIPMENT.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit GOLD MAINLY ON BEDROCK AND IN CREVICES IN TOP 2-5 FT. OF FRACTURED SLATY BEDROCK. TOP FEW FEET OF BEDROCK STRIPPED AND MINED. STREAM PLACER CONCENTRATES ENRICHED BY EROSION OF OLDER BENCH PLACERS. DEPTH TO BEDROCK 15-24 FT.; 4-7 FT. OF GRAVEL ON BEDROCK.
Deposit STREAM GRADIENT ABOUT 50 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-MAR-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.