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Treadwell Mine

Producer in Alaska, United States with commodities Gold, Silver, Lead, Copper, Molybdenum, Zinc, Arsenic, Tungsten
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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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Workings at the site
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10001321
MRDS ID A012061
Record type Site
Current site name Treadwell Mine
Alternate or previous names Alaska Treadwell Gold Mining Co.

Geographic coordinates

Geographic coordinates: -134.38006, 58.26642 (WGS84)

Site location context

Political divisions (FIPS codes)

Juneau(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Juneau B-2(quadrangle 1:63,360 scale)

Juneau SE(quadrangle 1:100,000 scale)

Juneau(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lynn Canal(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

LG(Federal land areas administered by LG)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • TREADWELL GLORY HOLE; AS PRINTED ON USGS JUNEAU B-2, 1:63360 QUADRANGLE 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
Lead Secondary
Copper Tertiary
Molybdenum Tertiary
Zinc Critical Tertiary
Arsenic Critical Tertiary
Tungsten Critical Tertiary

Comments on the commodity information

  • SCHEELITE REPORTED IN HEAVY MINERAL CONCENTRATES FROM TAILINGS

Materials information

Materials Type of material
Chalcopyrite Ore
Molybdenite Ore
Orpiment Ore
Realgar Ore
Scheelite Ore
Sphalerite Ore
Albite Gangue
Biotite Gangue
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Albitization

Analytical data

Result MINED GRADES RANGED FROM 1-2 PPM AU TO RARE 170 PPM SHOOTS, AVERAGE 4-5 PPM AU
Result SAMPLES COLLECTED IN 1983: 2-9 PPM AU, 0-1 PPM AG, 0.0 - 0.2% CU AND PB
Result USGS OFR 85-717, P. 210

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) -134.38006, 58.26642
ListMap

Economic information

Ore body information

  • General form PINCH AND SWELL

Controls for ore emplacement

  • Mineralization Unfined To Albite-Diorite Sills Near Slate/Hornblendite Contact Within The Seymour Canal Formation

Comments on the geologic information

  • IRREGULAR ALBITE-DIORITE SILLS INTRUDE A NNW STRIKING, NE DIPPING SLATE/HORNBLENDITE CONTACT ALONG A CHLORITE SCHIST HORIZON; THE HORNBLENDITE, OR "GREENSTONE" IN THE LITERATURE, APPEARS TO HAVE CONTROLLED THE EMPLACEMENT OF THE SILLS AND THE MINERALIZATION. ALBITE DIORITE INTRUDED INTO SLATE ALONG SLATE/HORNBLENDITE CONTACT.

Economic information about the deposit and operations

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

Comments on the production information

  • TOTAL PRODUCTION FOR ALL TREADWELL MINES: 3.2 MILLION OZ AU FROM 28.7 MILLION TONS OF ORE, USGS OFR 85-717, P. 210; DOLLAR VALUES MAY INCLUDE SMALL AMOUNTS OF AG AND PB PRODUCED AS BYPRODUCT; VALUE OF GOLD IN 1891-1916 WAS 20.67 DOLLARS/FINE OZ

Comments on the reserve resource information

  • MINING JOURNAL, VOL. 302, NO. 7755, P. 231

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 853.44M
    Overall length 1066.8M
    Overall width 121.92M

Comments on the workings information

  • 4 MINES CONNECTED UNDERGROUND AND OPERATED AS ONE; 15 PATENTED LODE CLAIMS, 18 UNPATENTED LODE CLAIMS AND 17 PLACER CLAIMS; THOUSANDS OF FT OF WORKINGS AND 3 MAJOR GLORY HOLES; 3 OF THE MINES: TREADWELL, MEXICAN, AND 700 FOOT, CAVED AND WERE FLOODED IN 3.5 HOURS ON APRIL 21, 1917

Comments on development

  • DISCOVERED 1881; EARLY PRODUCTION FROM GLORY-HOLE MINING AND PLACERS; LODE MINING 1882-1922; 4 MINES OPERATED AS ONE: TREADWELL, MEXICAN AND 700 FOOT MINES CAVED AND FLOODED IN 1917; READY BULLION MINE OPERATED UNTIL 1922; TREADWELL COMPLEX SOLD TO ALASKA-JUNEAU GOLD MINING CO. IN 1928; RECENT ACTIVITY: LEASED TO BARRICK RESOURCES IN MARCH, 1984; WGM INC. CONTRACTED TO EXPLORE AND ASSESS THE PROPERTY FOR POSSIBLE RE-OPENING; OPTIONED BY ECHO BAY MINES, LTD. IN 1985

Reference information

Bibliographic references

  • Deposit

    USGS 18TH ANNUAL REPORT, PART 3, P. 10, 12, 62-70

  • Deposit

    USGS BULL 287, P. 90-116

  • Deposit

    USGS BULL 662, P. 77-79

  • Deposit

    USGS OFR 60, P. 4, 21-22, 45, 93

  • Deposit

    ADGGS REPORT FOR THE YEAR 1966, P. 54, 60

  • Deposit

    USGS BULL 1246, P. 154-155

  • Deposit

    USBM IC 8331, P. 6-7

  • Deposit

    USBM OFR 22-69, P. 33

  • Deposit

    USGS OFR 85-717, P. 210-211

  • Deposit

    STONE, DAVID AND STONE, BRENDA, 1983, HARD ROCK GOLD, THE STORY OF THE GREAT MINES THAT WERE THE HEARTBEAT OF JUNEAU: SEATTLE, WASHINGTON, VANGUARD PRESS INC., P. 10-36

  • Other Database

    BAG-OFR-85-717-1979

  • Production

    STONE AND STONE, 1983, P. 34; USGS OFR 85-717, P. 210-211

General comments

Subject category Comment text
Deposit MINERALIZED ALBITE-DIORITE SILLS INTRUDED INTO SLATE-GRAYWACKE SEQUENCE; GOLD AND SULFIDES DISSEMINATED IN QUARTZ-CALCITE VEINS 0.1 IN TO 6 FT THICK AND IN HORSES OF SLATE; ORE SHOOTS 60-100 FT WIDE IN 20 TO 40 DEGREE DIPPING BANDS CONCENTRATED ALONG SLATE FOOTWALL OR IN SWELLS OF ALBITE-DIORITE SILLS; PYRITE IS DOMINANT SULFIDE, MINOR PYRRHOTITE, MOLYBDENITE, CHALCOPYRITE, MAGNETITE, RUTILE; RARE GALENA, SPHALERITE; TRACE ARSENIC, REALGAR, ORPIMENT, SCHEELITE; AU IS FREE, EVENLY DISTRIBUTED AND ASSOCIATED WITH QUARTZ-CALCITE VEINS, SECONDARY ALBITE AND PYRITE
Deposit SEE ALSO: TREADWELL MEXICAN, 700 FOOT, AND READY BULLION; MINES OF TREADWELL COMPLEX HAVE BEEN LISTED SEPARATELY TO ACCOMODATE PRODUCTION DATA; DATA COMBINED FOR TREADWELL, MEXICAN, 700 FT AND READY BULLION IN THIS LISTING ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1985 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Editor 14-APR-1994 Mosier, Dan 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.