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Jualin Mine

Producer in Alaska, United States with commodities Gold, Silver, Copper, Lead, Zinc
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Geologic information

Identification information

Deposit ID 10107522
MRDS ID A012016
Record type Site
Current site name Jualin Mine
Related records 10282821

Geographic coordinates

Geographic coordinates: -135.04706, 58.84114 (WGS84)
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • PRINTED ON JUNEAU D-4 QUAD, 1:63360 TOPOGRAPHIC SERIES 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
Copper Tertiary
Lead Tertiary
Zinc Tertiary

Comments on the commodity information

  • RATIO OF GOLD: SILVER WAS 2.77: 1.00 IN OZ OF METAL RECOVERED FROM 40000 TONS OF ORE, METZ AND WIEBMAR, 1977 UNPUB. REPORT; NO OTHER REFERENCE MENTIONS SILVER AT JUALIN; MILL RECORDS LIST EXTRACTIONS OF 85% IN AMALGAM AND 5% IN CONCENTRATES OF PYRITE, CHALCOPYRITE AND GALENA

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Ankerite Gangue
Calcite Gangue
Malachite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Diorite Pervasively Chloritized, Local Sericite And Epidote

Analytical data

Result 14-53 PPM AU IN VEINS
Result AVERAGED 20 PPM AU, USGS OFR 85-717, NO. J102

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Jualin Diorite; Massive Altered Diorite, Mainly Plagioclase, Hornblende And Biotite With Minor Epidote, Chlorite, Calcite, Sericite And Magnetite;Coast Range Batholith; Quartz Diorite Gneiss
    Rock description Jualin Diorite; Massive Altered Diorite, Mainly Plagioclase, Hornblende And Biotite With Minor Epidote, Chlorite, Calcite, Sericite And Magnetite;Coast Range Batholith; Quartz Diorite Gneiss
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Berners Formation; Interstratified Slate And Graywacke With Volcanic Unit Of Augite Melaphyres And Pyroclastics
    Rock description Berners Formation; Interstratified Slate And Graywacke With Volcanic Unit Of Augite Melaphyres And Pyroclastics

Nearby scientific data

(1) -135.04706, 58.84114
ListMap

Geologic structures

Type of structure Regional
Structure description Regional Attitude Of Planar Features; Including Bedding, Foliation In Gneiss, Major Contacts, Etc.; Is N 40 W, 60 To 90 Ne

Ore body information

  • Strike N 40 W
    Dip 70 NE
    Thickness 3.05M

Comments on the geologic information

  • GENERAL GEOLOGY: COUNTRY ROCK IS MAINLY SLATE, GRAYWACKE AND VOLCANICS OF THE K-JR BERNERS FORMATION AND A CONTEMPORANEOUS SERIES OF EPIDOTE-BEARING AMYGDALOIDAL META BASALTS WHICH STRIKE NW AND DIP 70 NE; REGIONAL ATTITUDES OF PLANAR FEATURES ROUGHLY PARALLEL CONTACT OF QUARTZ DIORITE GNEISS OF THE COAST RANGE BATHOLITH TO THE NE; THE BERNERS FM, META BASALTS AND QUARTZ DIORITE GNEISS ARE INTRUDED BY THE JUALIN DIORITE; HORNBLENDITE LOCALLY DEVELOPED ALONG CONTACT; MINERALIZATION IN BERNER'S BAY AREA OCCURS WITHIN THE JUALIN DIORITE OR IN COUNTRY ROCK ADJACENT OT ITS CONTACTS

Economic information

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1895
Discoverer Frank Cook
Year of first production 1896
Year of last production 1917

Mining district

District name Juneau/Berner'S Bay

Land status

Ownership category National Forest

Comments on the production information

  • RECORDS INCOMPLETE; JUALIN MINE AND NEARBY COMET MINE ACCOUNTED FOR 86% OF PRODUCTION FROM BERNER'S BAY AREA

Reserves and resources

  • Type In-situ
    Estimate year 1977
    Commodity Subtype Grade units Group Importance Year
    Gold Au 14.117 g/mt Gold Major 1977

Comments on the reserve resource information

  • ADGGS SR 33, P. 12
  • METZ AND WIEBMER, 1977 UNPUB. REPORT; ADGGS SR 33, P. 12

Workings at the site

  • Type of workings Surface/Underground
    Length 5486.4M
    Overall depth 121.92M

Comments on the workings information

  • MORE THAN 18000 FT UNDERGROUND WORKINGS ON 4 LEVELS, EXCLUSIVE OF STOPES; MILL ON SITE BURNED IN 1920; WORKINGS NOT OPEN; INFLOW OF WATER ALONG FAULTS WAS A MAJOR PROBLEM; PRODUCTION CAME FROM 3 VEINS, TWO OTHER VEINS PARTIALLY DEVELOPED, SOME PROMISING PROSPECTS FOUND AFTER MINE CLOSURE IN 1917

Comments on development

  • PRODUCTION IN 1896-1900, 1903, 1905-1908 AND 1915-1917; EXPLORATION AND DEVELOPMENT UNTIL 1920; PROPERTY DRILLED IN 1983 AND 1984; 1984 WORK WAS DONE BY KENNECOTT AND PARTNERS, 949 FT OF CORE DRILLED; 1983 WORK DONE BY BEAR CR. MINING CO., ON LEASE FROM HYAK MINING CO.; 34 PATENTED LODE CLAIMS

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012016

Bibliographic references

  • Deposit

    USGS BULL 284, P. 33-34

  • Deposit

    USGS BULL 446, P. 44-47

  • Deposit

    USGS BULL 662, P. 81-82

  • Deposit

    USGS BULL 714, P. 107-108

  • Deposit

    METZ, PAUL A. AND WIEBMER, JOHN D., 1977, MINERAL INDUSTRY RESEARCH LABORATORY SUMMARY FILE REPORT, EUREKA, KENSINGTON, COMET, JOHNSON AND JUALIN MINES, BERNER'S BAY, JUNEAU DISTRICT, ALASKA: UNPUBLISHED REPORT SUBMITTED TO U.S.B.M. ALASKA FIELD OPERATIONS CENTER, JUNEAU, AK

  • Deposit

    USGS BULL 755, P. 24-25

  • Deposit

    USGS BULL 1246, P. 159-160

  • Deposit

    USGS OFR 84-572, P. 159, NO. 24

  • Deposit

    ADGGS SR 38, P. 13

  • Deposit

    USGS OFR 85-717, NO. J102

  • Other Database

    BAG-OFR-85-717-102

  • Production

    METZ AND WIEBMER, 1977 UNPUB. REPORT; USGS BULL 755, P. 25; USGS OFR 84-572, P. 159, NO. 24

General comments

Subject category Comment text
Deposit 100-300 FT WIDE SHEAR ZONE CONTAINS 4 TO 5 QUARTZ FISSURE VEINS 2 TO 10 FT WIDE, AVE. 5 FT; 400-600 FT HORIZONTAL EXTENT AND 600 FT IN VERTICAL EXTENT; VEINS CARRY PYRITE, CHALCOPYRITE, GALENA, A LITTLE SPHALERITE, MALACHITE AND AZURITE AS WELL AS FREE GOLD
Deposit SEE ALSO: KENSINGTON, COMET, EUREKA, JOHNSON; IN 1928, A AU-BEARING QUARTZ VEIN 9 FT WIDE WAS FOUND IN MINERALIZED AREA 49 FT WIDE BY TRENCHING 650 FT SW OF OLD MINE; DRILLING IN 1983 AND 1984 LOCATED THIN INTERCEPTS OF MODERATE GRADE AU MINERALIZATION IN QUARTZ VEINS; SEE ADGGS SR 38, P. 13 ; 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