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Greens Creek Prospect

Prospect in Alaska, United States with commodities Zinc, Silver, Lead, Gold, Copper, Bismuth
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10096784
MRDS ID A012083
Record type Site
Current site name Greens Creek Prospect
Alternate or previous names Big Sore

Geographic coordinates

Geographic coordinates: -134.62144, 58.07668 (WGS84)

Site location context

Political divisions (FIPS codes)

Juneau(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

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

Juneau SE(quadrangle 1:100,000 scale)

Juneau(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Admiralty Island(hydrologic unit)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • LOCATION APPROXIMATED FROM USGS OFR 85-717, NO. J082 CLAIMS COVER LARGE AREA LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Zinc Critical Primary
Silver Primary
Lead Primary
Gold Primary
Copper Secondary
Bismuth Critical Tertiary

Materials information

Materials Type of material
Bornite Ore
Bournonite Ore
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Tetrahedrite Ore
Barite Gangue
Pyrite Gangue
Pyrrhotite Gangue

Alteration

  • (Local) Sericite, Chlorite, Talc And Mariposite Occur In Tuffite Below The Mineralization

Analytical data

Result AVERAGE GRADE: 0.5% CU, 2.5% PB, 7-10% ZN, 283.5 GM/TON AG, 2.8 GM/TON AU, CIM BULL, V. 74, NO. 833, P. 57

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Serpentinite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Argillite

Nearby scientific data

(1) -134.62144, 58.07668
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Anticlinorium
Type of structure Local
Structure description Overturned Anticline

Ore body information

  • General form TABULAR
    Strike NW TREND
    Dip STEEP
    Length 1066.8M
    Depth to top 0M

Controls for ore emplacement

  • Deposit Is Located In The Nose Of A Large Anticlinorium, Along The Lower Limb Of An Overturned Anticline; Precious Metal Content May Increase With Depth Along Limb Of Fold, Where Mineralization Is Localized In Several Trough Shaped Pods

Comments on the geologic information

  • DOMINANT STRATIGRAPHIC UNITS ARE MAFIC VOLCANIC ROCKS, SERPENTINITES AND TUFFACEOUS VOLCANICLASTIC ROCKS

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1974
Discoverer Pan Sound Joint Ventures (Marietta Resources International; Exalas Resources Corp.; Texas Gas Resources Corp.; Noranda Exploration, Inc.

Mining district

District name Admiralty

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Noranda Mining, Inc.
    First year 1985
  • Type Owner
    Owner Anaconda Minerals Co. (39.5%) ; Noranda Exploration, Inc. (39.5%); Texas Gas Resources C
    First year 1985

Workings at the site

  • Type of workings Surface/Underground
    Length 1524M

Comments on the workings information

  • BY END OF 1984: MORE THAN 85000 FT OF LORE DRILLING FROM 170 SURFACE AND SUBSURFACE STATIONS AND APPROXIMATELY 5000 FT OF DRIFTS COMPLETED

Comments on development

  • CURRENTLY (AS OF 1985) UNDERGOING MINING FEASIBILITY STUDY AND VALIDATION OF CLAIMS PENDING USDA DECISION ON BOUNDARY ADJUSTMENTS TO ADMIRALTY I. NATIONAL MONUMENT; MINING COULD BEGIN BY 1987 AT 300 TPD USING OPEN STOPE METHODS, WITH GRADUAL INCREASE TO 600 TPD

Reference information

Bibliographic references

  • Deposit

    CIM BULL, V. 74, NO. 833, P. 57

  • Deposit

    ADGGS SR 38, P. 18-19

  • Deposit

    ADGGS SR 31, P. 18

  • Deposit

    ALASKA CONSTRUCTION AND OIL, SEPT 1982, P. 44-48

  • Deposit

    USGS CIRC 940, P. 29-30

  • Deposit

    E AND MJ MINING ACTIVITY DIGEST, V. 11, NO. 5, P. 9

  • Deposit

    ENGINEERING AND MINING JOURNAL, VOL. 185, NO. 1, P. 39

  • Deposit

    USGS OFR 85-717, P. 95

  • Other Database

    BAG-OFR-85-717-082

General comments

Subject category Comment text
Deposit STRATIFORM HORIZON AT TUFFITE/ARGILLITE CONTACT CONTAINS MASSIVE SULFIDE, VEIN AND DISSEMINATED ORE; 0.5 FT THICK AU/AG-RICH ZONES, BASEMETAL RICH ZONES UP TO 90 FT THICK; MASSIVE BANDED ZN-RICH ORE OCCURS IN 5 STRATIFORM PODS WHICH AVERAGE 11-FT THICK; PYRITE, QUARTZ-PYRITE AND CHALCOPYRITE-BORNITE VEINS OCCUR STRATIGRAPHICALLY BELOW (?) THESE PODS; 3500 FT MINIMUM STRIKE LENGTH; WHITE CHERT AND BARITE-RICH ZONES WITH HIGH AU-AG VALVES OCCUR ON THE ENDS OF THE MASSIVE ORE ZONE
Deposit MOST LIKELY MAJOR HARD-ROCK MINING VENTURE IN ALASKA TO ACHIEVE NEW PRODUCTION IN THE 1980'S ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-85 Leonard, Kenneth R. (Elliott, R. L.) U.S. Geological Survey
Updater 10-JUN-92 Beougher, Dee (Spanski, Gregory T.) U.S. Geological Survey
Editor 14-APR-94 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.