Alaska-Juneau Mine

The Alaska-Juneau 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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Alaska-Juneau Mine
Secondary: Alaska Juneau Gold Mining Co.
Secondary: Mines: A.J., Perseverance, Ebner
Secondary: Orebodies: North Ore Body, South Ore Body

Commodity

Primary: Gold
Secondary: Silver
Secondary: Lead
Tertiary: Zinc
Tertiary: Copper

Location

State: Alaska
District: Juneau/Gold Creek

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Echo Bay Mines, Ltd.
Years: 1985 -

Owner Name: Alaska Electric Light And Power Co.
Home Office: Juneau, AK
Years: 1985 -

Owner Name: City And Borough Of Juneau
Home Office: Juneau, AK
Years: 1985 -

Production

Year: 1934
Year: 1933
Year: 1932
Year: 1931
Year: 1930
Time Period: 1921-1930
Year: 1920
Time Period: 1914-1920
Year: 1935

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1893
Year Last Production: 1944
Discovery Year: 1880
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Form: IRREGULAR, LENSE

Form: IRREGULAR, LENSE

Structure

Type: R
Description: Area Sw Of Coast Range Intrusive Complex Is Metamorphic Belt With Well Developed Nw Trending Isoclinal Fold System; Minor Fold Axes Plunge Steeply Ne; Two Major Fault Sets: Nw Striking Longitudinal Faults And Steeply Dipping E-W Striking Transverse Faults

Type: L
Description: A.J. Lode System Is Bisected By E W Trending, Transverse-Normal, Silverbow Fault; Dip 70 N; Ebner Mine And North Ore Body Have Been Offset To The W And Dropped Relative To South Ore Body And Perseverance Mine

Alterations

Not available

Rocks

Name: Gneiss
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 65.500000+-3.500000
Dating Method: U-Pb (zircon)
Material Analyzed: Zircon
Age Young: Paleocene
Age Old: Cretaceous

Analytical Data

Analytical Data: AVERAGE 7-15 PPM AU, USGS OFR 85-717
Analytical Data: AVE GRADE OF 88,500,000 TONS MINED WAS 0.0432 OZ/TON AU, NOEL, 1966, 1966, P. 54

Materials

Ore: Chalcopyrite
Ore: Sphalerite
Gangue: Pyrrhotite
Gangue: Quartz
Gangue: Ankerite
Gangue: Pyrite

Comments

Comment (Geology): THE ALASKA-JUNEAU LODE SYSTEM IS CONFINED TO THE FOOTWALL PORTION OF THE PERSEVERANCE SLATE, NEAR A STRONGLY DISCORDANT QUARTZ DIORITIC PLUTON OF THE COAST RANGE INTRUSIVE COMPLEX; MINERAL ASSEMBLAGES IN METAMORPHIC BELT SW OF INTRUSIVE COMPLEX INDICATE A BARROVIAN METAMORPHIC FACIES SERIES GRADING FROM GREENSCHIST FACIES TO AMPHIBOLITE FACIES TOWARD THE COMPLEX. PERSEVERANCE SLATE; DOMINANTLY PHYLLITE, MINOR SEMISCHIST INTERCALATED WITH SILL-LIKE AMPHIBOLITE BODIES; GREENSCHIST MM FACIES. GASTINEAU VOLCANICS; LAVA FLOWS, TUFFS AND SEDIMENTS THAT HAVE BEEN METAMORPHOSED TO HORNBLENDE SCHIST, GREENSTONE AND GREEN SCHIST. MT JUNEAU PLUTON; COMPOSITE BODY OF POORLY FOLIATED TONALITE, GRANODIORITE, ADAMELLITE AND COMPLEX INTRUSIVE BRECCIAS.

Comment (Deposit): NETWORK OF QUARTZ VEINS AND STRINGERS FROM 1 IN TO 2-3 FT WIDE CONFINED TO A BAND ABOUT 300 FT WIDE AND 18,500 FT LONG IN PORTION OF PERSEVERANCE SLATE ADJACENT TO CONTACT WITH UNDERLYING? GASTINEAU VOLCANICS; LODE SYSTEM DIVIDED INTO NORTH ORE BODY AND SOUTH ORE BODY BY TRANSVERSE NORMAL FAULT; 95% OF VEIN MATERIAL IS QUARTZ, 1-3% CARBONATES; 2-3% SULFIDES; VEINS CARRY: PYRRHOTITE, PYRITE, ARSENOPYRITE, GALENA, SPHALERITE, CHALCOPYRITE AND FREE GOLD; ORE BODIES PRIMARILY ASSAY BOUNDED, WITH GREATEST AU VALVES IN GROUND CONTAINING ABUNDANT QUARTZ VEINS IN AND NEAR THE ENDS OF AMPHIBOLITE SILLS INTERCALATED WITH PHYLLITE

Comment (Deposit): SEE ALSO: PERSEVERANCE, EBNER; IN ITS DAY, THE A.J. COMPLEX WAS WORLD CLASS, LOW GRADE OPERATION; WAS "THE ONLY MINE IN THE WORLD TO HAVE SUCCESSFULLY OPERATED ON ORE OF SUCH LOW GRADE," USGS OFR 60, P.166; I N 1985, PLANS MADE TO DREDGE AND PROCESS MINE TAILINGS IN GASTINEAU CH ANNEL FROM ALASKA-JUNEAU AND ALASKA GASTINEAU OPERATIONS ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 5 PERS COMM

Comment (Workings): SEVERAL MILES OF UNDERGROUND WORKINGS AND GLORY HOLES; STOPES 100-200 FT WIDE, 300-400 FT LONG OVER 1000-2500 FT IN VERTICAL EXTENT: A.J. MINE WAS EVENTUALLY CONNECTED TO EBNER AND PERSEVERANCE WORKINGS AND ALL WERE OPERATED AS ONE MINE; 8000 TPD MILL COMPLETED IN 1917 WAS NOT EFFICIENT ENOUGH TO OPERATE PROFITABLY; MILL RENOVATED TO INCLUDE HAND-SORTING OF ORE 1920-1925, RESULTING IN INCREASE OF CAPACITY TO 10000 TPD WITH VERY EFFICIENT RECOVERY

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

Comment (Commodity): NEARLY ALL SULFIDES CARRY MINOR AU; AVE FINENESS OF BULLION: 850 AU, 130 AG, USGS OFR 60, P. 139-140

Comment (Production): PRODUCTION FIGURES INCLUDE EBNER AND PERSEVERANCE MINES FOR YEARS AFTER AQUISITION BY A.J.; TOTAL PRODUCTION FOR 1893-1944, INCLUDING PLANT CLEAN-UP VALVES: 88466078 TONS TRAMMED FROM WHICH 47192108 TONS WERE MILLED TO PRODUCE 2888996 OZ AU, 1949819 OZ AG AND 40219231 LB PB

Comment (Development): 23 PATENTED LODE CLAIMS ORGANIZED AS ALASKA JUNEAU GOLD MINING CO., 1897; EARLY PRODUCTION FROM RESIDUAL PLACERS AND "GLORY HOLE" MINING; UNDERGROUND MINING BEGAN 1903; ADJOINING EBNER MINE LEASED IN 1925 AND OPERATED OPN AROY ATTY BASIS; TREADWELL PROPERTIES ACQUIRED IN 1928; ACQUIRED PERSEVERANCE MINE, 1933; MINE SHUT DOWN, 1944, RECENT ACTIVITY: LEASED TO BARRICK RESOURCES CORP. IN MARCH 1984; WGM, INC. CONTACTED TO ASSESS ALASKA-JUNEAU AND TREADWELL PROPERTIES FOR POSSIBLE RE-OPENING; OPTIONED BY ECHO BAY MINES LTD, 1985

Comment (Location): SHAFT AT EASTERNMOST TERMINUS OF ALASKA-JUNEAU MAIN HAVLAGE ADIT; ROUGHLY COINCIDENT WITH OLD GLORY HOLE WORKINGS ON SOUTH ORE BODY LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

References

Reference (Deposit): USGS OFR 60

Reference (Deposit): ENGINEERING AND MINING JOURNAL, VOL.133, NO.9

Reference (Deposit): ADGGS GR 1, P.19-21

Reference (Deposit): NOEL, G.A., 1966, THE PRODUCTIVE MINERAL DEPOSITS OF SOUTHEAST ALASKA, IN ADGGS REPORT FOR THE YEAR 1966: JUNEAU, ALASKA, P.54, 60

Reference (Deposit): MINING JOURNAL, VOL. 302, NO. 7755, P.230-231

Reference (Deposit): USGS OFR 85-395

Reference (Deposit): USGS CIRC 700, P.54-56

Reference (Deposit): ADGGS SR 38, P.14

Reference (Deposit): STONE, DAVID AND STONE, BRENDA, 1983, HARD ROCK GOLD, THE STORY OF THE GREAT MINES THAT WERE THE HEARTBEAT OF JUNEAU: SEATTLE, WASH., VANGUARD PRESS INC., P.57-78

Reference (Deposit): USGS OFR 85-717, P.178

Reference (Other Database): BAG-OFR-85-717-165

Reference (Production): USGS OFR 60, TABLE 2

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