Treadwell Mines

Past Producer in Alaska, United States with commodities Gold, Silver, Lead, Zinc, Copper, Molybdenum, Tungsten, Antimony, Arsenic

Geologic information

Identification information

Deposit ID 10000503
MRDS ID A010692
Record type Site
Current site name Treadwell Mines
Alternate or previous names Alaska Treadwell, Alaska Mexican, Ready Bullion, Seven Hundred Foot

Geographic coordinates

Geographic coordinates: -134.377, 58.26642 (WGS84)
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Lead Secondary
Zinc Tertiary
Copper Tertiary
Molybdenum Tertiary
Tungsten Tertiary
Antimony Tertiary
Arsenic Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Molybdenite Ore
Orpiment Ore
Realgar Ore
Sphalerite Ore
Tetrahedrite Ore
Albite Gangue
Calcite Gangue
Magnetite Gangue
Pyrite Gangue
Pyrrhotite Gangue
Quartz Gangue
Rutile Gangue

Alteration

  • (Local) Diorite Highly Altered (Albitized & Pyritized) In Part

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 > Metasedimentary Rock > Slate

Nearby scientific data

(1) -134.377, 58.26642

Ore body information

  • General form TABULAR
    Strike NNW
    Dip NE STEEP
    Thickness 121.92M
    Depth to top 0M
    Length 1066.8M

Controls for ore emplacement

  • Ore Shoots Were Concentrated Along The Slate Footwall. Gold Associated With Quartz-Calcite Veins, Albite, And Pyrite

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1881
Year of first production 1882
Year of last production 1922

Production statistics

  • Year 1922
    Period 1885-1922
    Accuracy Estimate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 3g/mt

Comments on the production information

  • CUMULATIVE PRODUCTION FIGURES ARE FOR ALL FOUR MINES

Comments on the reserve resource information

  • NORTHERN MINER MARCH 29, 1984, P. 12

Workings at the site

  • Type of workings Surface/Underground
    Length 4827.9M
    Overall depth 822.96M

Comments on the workings information

  • ALL FOUR MINES OF THE TREADWELL COMPLEX WERE CONNECTED UNDERGROUND. THE READY BULLION MINE WAS SEPARATED FROM THE OTHERS BY A WATERTIGHT BULKHEAD AND WAS NOT FLOODED WITH THE TREADWELL, SEVEN HUNDRED FOOT, AND MEXICAN MINES IN 1917, ALSO FOUR MAJOR GLORY HOLES.

Comments on development

  • LEASED TO BARRICK RESOURCES IN 1984 FOR LONG TERM EXPLORATION, DEVELOPMENT, AND PRODUCTION (?) PROGRAM

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010692

Bibliographic references

  • Deposit

    USGS OFR 78-374, P. 125-128

  • Deposit

    STONE, DAVID, AND STONE, BRENDA, 1980, HARD ROCK GOLD: JUNEAU, CITY AND BOROUGH OF JUNEAU, JUNEAU CENTENNIAL COMMITTEE, 108 P.

  • Deposit

    NORTHERN MINER, MARCH 29, 1984, P. 12

  • Production

    USGS OFR 78-374

General comments

Subject category Comment text
Deposit GOLD-AND SULFIDE-BEARING QUARTZ VEINS IN SHATTERED ALBITE DIORITE SILLS IN SEQUENCE OF SLATE BELOW GREENSTONE HANGING WALL. SLATE HORSES IN VEINS ALSO MINERALIZED
Deposit FOUR MAJOR MINES OWNED BY THREE (RELATED) COMPANIES MINED SEGMENTS OF ONE MAJOR VEIN STRUCTURE OVER 3500 FT LONG. THREE OF THE FOUR MINES WERE FLOODED BY SEAWATER IN 1917 AND NEVER REOPENED. THE THREE COMPANIES MERGED FOLLOWING THE FLOODING. THE FOURTH MINE CLOSED IN 1922. ALL PROPERTIES WERE SOLD TO THE ALASKA JUNEAU GOLD MINING CO. IN 1928. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1984 Elliott, R. L. U.S. Geological Survey
Editor 13-APR-1994 Mosier, Dan U.S. Geological Survey