Treadwell Mine

The Treadwell Mine is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Treadwell Mine
Secondary: Alaska Treadwell Gold Mining Co.

Commodity

Primary: Gold
Secondary: Silver
Secondary: Lead
Tertiary: Zinc
Tertiary: Arsenic
Tertiary: Tungsten
Tertiary: Molybdenum
Tertiary: Copper

Location

State: Alaska

Land Status

Not available

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1882
Year Last Production: 1922
Discovery Year: 1881
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Form: PINCH AND SWELL

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Albitization

Rocks

Not available

Analytical Data

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

Materials

Ore: Molybdenite
Ore: Realgar
Ore: Scheelite
Ore: Chalcopyrite
Ore: Orpiment
Ore: Sphalerite
Gangue: Biotite
Gangue: Calcite
Gangue: Quartz
Gangue: Albite

Comments

Comment (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

Comment (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

Comment (Workings): 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

Comment (Geology): 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.

Comment (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

Comment (Location): 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).

Comment (Production): 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

Comment (Reserve-Resource): MINING JOURNAL, VOL. 302, NO. 7755, P. 231

Comment (Commodity): SCHEELITE REPORTED IN HEAVY MINERAL CONCENTRATES FROM TAILINGS

References

Reference (Deposit): USGS 18TH ANNUAL REPORT, PART 3, P. 10, 12, 62-70

Reference (Deposit): USGS BULL 287, P. 90-116

Reference (Deposit): USGS BULL 662, P. 77-79

Reference (Deposit): USGS OFR 60, P. 4, 21-22, 45, 93

Reference (Deposit): ADGGS REPORT FOR THE YEAR 1966, P. 54, 60

Reference (Deposit): USGS BULL 1246, P. 154-155

Reference (Deposit): USBM IC 8331, P. 6-7

Reference (Deposit): USBM OFR 22-69, P. 33

Reference (Deposit): USGS OFR 85-717, P. 210-211

Reference (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

Reference (Other Database): BAG-OFR-85-717-1979

Reference (Production): STONE AND STONE, 1983, P. 34; USGS OFR 85-717, P. 210-211

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