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Eisenbrey Deposit

Unknown in Rusk county in Wisconsin, United States with commodities Zinc, Copper, Gold, Silver
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Reserves and resources
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10082579
MRDS ID W060005
Record type Site
Current site name Eisenbrey Deposit
Alternate or previous names Thornapple Deposit

Geographic coordinates

Geographic coordinates: -91.118, 45.4406 (WGS84)
Relative position 3 MILES NORTHWEST OF FLAMBEAU DEPOSIT (NEAR TOWN OF LADYSMITH)

Site location context

Political divisions (FIPS codes)

Rusk(county)

Wisconsin(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ladysmith(quadrangle 1:24,000 scale)

Bloomer(quadrangle 1:100,000 scale)

Rice Lake(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Flambeau(hydrologic unit)

Chippewa(hydrologic accounting unit)

Chippewa(hydrologic subregion)

Upper Mississippi(hydrologic region)

Geographic areas

Country State County
United States Wisconsin Rusk

Commodities

Commodity Importance
Zinc Critical Primary
Copper Primary
Gold Tertiary
Silver Tertiary

Comments on the commodity information

  • TYPICAL ZN-CU-TYPE VMS DEPOSITS IN WISCONSIN CONTAIN: PYRITE, PYRRHOTITE, SPHALERITE , CHALCOPYRITE, (SOMETIMES GALENA, MAGNETITE,) WITH MINOR AMOUNTS OF ARSENOPYRITE, TETRAHEDRITE, TENNANTITE (SOMETIMES MARCASITE, ELECTRUM,COVELLITE, CHALCOCITE).

Alteration

  • (Local) Lower Amphibolite Facies--Dominantly Kyanite-Sillimanite-Staurolite-Hornblende-Almandine Assemblages (Amphibolite Facies).

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 Host
    Rock type Metamorphic Rock > Schist
    Stratigraphic age (youngest) Paleoproterozoic

Nearby scientific data

(1) -91.118, 45.4406
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description A Nearly Vertically Dipping And Plunging Complexly Folded Deposit.

Ore body information

  • Name THORNAPPLE
    General form Stacked lenses

Comments on the ore body information

  • Most Wisconsin VMS deposits have this style of orebodies. Massive sulfide lenses at several stratigraphic levels connected by zones of sulfide bearing stringers, some with intense alteration.Metal zonation and/or upward base-precious metal refining from lowermost lens to upper lens is common. (DeMatties, 1996)

Comments on the geologic information

  • THE DOMINANT LITHOLOGY IS AMPHIBOLITE OR AMPHIBOLITE SCHIST AND LESSER QUARTZO-MICACEOUS TO QUARTZO-FELDSPATHIC SCHISTS. THE DEPOSIT OCCURS IN THE AMPHIBOLITE SUCCESSION OF THE MAIN VOLCANIC SEQUENCE.

Economic information about the deposit and operations

Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1973
Discoverer Great Lakes Exploration Co.

Mining district

District name Ladysmith

Reserves and resources

  • Type In-situ
    Estimate year 1996
    Total resources 2720000mt
    Remarks DeMatties (1996)
    Commodity Subtype Grade units Group Importance Year
    Zinc Zn 3.4 wt-pct Zinc Primary 1996
    Copper Cu 1.5 wt-pct Copper Primary 1996

Comments on the reserve resource information

  • THE DEPOSIT IS OPEN TO DEPTH. CU AND AU VALUES ARE ERRATIC AND ZN VALUES ARE LOW.

Comments on development

  • IN 1995, DEEP DRILLING INTERSECTED LOW-GRADE SULFIDES THAT INCREASED THE TONNAGE BUT NOT THE ECONOMICS. ; ECON.COM: IN 1970, THE FOURTH DRILL HOLE AT THORNAPPLE INTERSECTED THICK SULFIDES WITH INTERVALS OF COPPER AND ZINC MINERALIZATION. IT WAS KENNECOTT'S SECOND VOLCANOGENIC MASSIVE SULFIDE DISCOVERY IN WISCONSIN. DISCOVERED USING AEROMAGNETICS.

Reference information

Bibliographic references

  • Deposit

    CRAWFORD, M.J., 1996, WISCONSIN EXPLORATION UPDATE: SKILLINGS MINING REVIEW, V. 85, NO. 21, P.4-5.

  • Deposit

    MAY, E.R., 1996, EISENBREY--A STRUCTURALLY COMPLEX PROTEROZOIC COPPER-ZINC MASSIVE SULFIDE DEPOSIT, RUSK COUNTY, WISCONSIN, IN LABERGE, G.L., ED., VOLCANOGENIC MASSIVE SULFIDE DEPOSITS OF NORTHERN WISCONSIN--A COMMEMORATIVE VOLUME: INSTITUTE ON LAKE SUPERIOR GEOLOGY, PROCEEDINGS, V. 42, PT. 2, 107-128.

  • Deposit

    LABERGE, G.L., ED.,1996, VOLCANOGENIC MASSIVE SULFIDE DEPOSITS OF NORTHERN WISCONSIN--A COMMEMORATIVE VOLUME: INSTITUTE ON LAKE SUPERIOR GEOLOGY, PROCEEDINGS, V. 42, PT. 2 (GENERAL REFERENCE FOR WISCONSIN VMS DEPOSITS).

  • Reserve-Resource

    MAY, 1996 P. 107-108.

  • Reserve-Resource

    DeMatties, T. A., 1996, A GEOLOGIC FRAMEWORK FOR EARLY PROTEROZOIC VOLCANOGENIC MASSIVE SULFIDE DEPOSITS IN WISCONSIN: AN EXPLORATION MODEL. In, Laberge, G., editor, Volcanogenic Massive Sulfide Deposits of Wisconsin: A Commemorative Volume, Insitiute on Lake Superior Geology Proceedings, v. 42, part 2, P. 31-65.

  • Orebody

    DeMatties, T. A., 1996, A GEOLOGIC FRAMEWORK FOR EARLY PROTEROZOIC VOLCANOGENIC MASSIVE SULFIDE DEPOSITS IN WISCONSIN: AN EXPLORATION MODEL. In, Laberge, G., editor, Volcanogenic Massive Sulfide Deposits of Wisconsin: A Commemorative Volume, Insitiute on Lake Superior Geology Proceedings, v. 42, part 2, P. 31-65.

General comments

Subject category Comment text
Deposit CLASSIFIED BY LABERGE (1996) AS A ZN-CU-TYPE VOLCANOGENIC MASSIVE SULFIDE DEPOSIT THAT FORMED IN THE MAIN VOLCANIC ARC OF THE METAVOLCANOGENIC COMPLEX. SYNGENETIC STRATIFORM, DOMINANTLY MASSIVE SULFIDES PYRRHOTITE-PYRITE ASSOCIATED WITH CHERTY MAGNETIC IRON-FORMATION.
Deposit IN 1994, RENAMED FOR E.H. "NED" EISENBREY (1926-85), ONE OF THE FATHERS OF THE STUDY OF AND EXPLORATION FOR VOLCANOGENIC MASSIVE SULFIDE DEPOSITS IN WISCONSIN, WHO RECOGNIZED AND PROPOSED DRILLING AT THE THORNAPPLE SITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-95 Nicholson, S.W. U.S. Geological Survey
Updater 01-MAR-97 Sutphin, David M. U.S. Geological Survey
Editor 01-MAY-97 Mason Jr., G.T. U.S. Geological Survey
Reporter 13-JUL-11 Lipin, Bruce U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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