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Tofty Gulch Placer

Producer in Alaska, United States with commodities Gold, Silver, Tin, Chromium
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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. Links to other databases
  11. Bibliographic references
  12. General comments
  13. Reporter information

Geologic information

Identification information

Deposit ID 10107544
MRDS ID A015201
Record type Site
Current site name Tofty Gulch Placer
Related records 10185045

Geographic coordinates

Geographic coordinates: -150.90028, 65.08517 (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

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

Tanana SE(quadrangle 1:100,000 scale)

Tanana(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-371, LOC. 29. COORDINATES REPRESENT MINE MARKED NEAR MOUTH OF TOFTY GULCH ON TANANA (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
Silver Primary
Tin Critical Primary
Chromium Critical Tertiary

Materials information

Materials Type of material
Gold Ore
Cassiterite Unknown
Chromite Unknown

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite
  • Host or associated Host
    Rock type Metamorphic Rock > Phyllite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone

Nearby scientific data

(1) -150.90028, 65.08517
ListMap

Economic information

Comments on the geologic information

  • GRAVEL CONTAINS QUARTZITE AND OTHER EXOTIC BOULDERS. ; MAJOR.UNITS: BEDROCK IS JURASSIC-CRETACEOUS PHYLLITE AND INTERBEDDED GRAYWACKE. BEDROCK CONTAINS MANY QUARTZ VEINS THAT CARRY A LITTLE PYRITE, BUT NO GOLD OR CASSITERITE.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1906
Year of first production 1909

Comments on development

  • GOLD DISCOVERED IN WINTER OF 1906-07. MINING IN 1909-12, 1917, 1929, 1941, AND 1975. DITCH BUILT FOR OPEN-CUT MINING, 1908. MINED BY WASHING PLANT, 3 BULLDOZERS, AND 2 DRAGLINES IN 1975. PROSPECT DRILLING WEST OF GULCH IN 1941.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit STREAM GRADIENT ABOUT 75 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.
Deposit Discovery Year: 1906-07
Deposit GOLD IN GRAVEL AND IN UPPER 2-3 FT. OF BEDROCK. GRAVEL AS MUCH AS 7 FT. THICK BENEATH 10-25 FT. OF FROZEN MUCK AND SILT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-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.