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  3. Mineral Resource Data System (MRDS)

Central Boulder Lake

Unknown in St. Louis county in Minnesota, United States with commodities Iron, Titanium, Metal, Copper, Nickel
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials 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. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10082827
MRDS ID W062181
Record type Site
Current site name Central Boulder Lake

Geographic coordinates

Geographic coordinates: -92.17686, 47.06832 (WGS84)

Site location context

Political divisions (FIPS codes)

St. Louis(county)

Minnesota(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Boulder Lake Reservoir(quadrangle 1:24,000 scale)

Hibbing(quadrangle 1:100,000 scale)

Hibbing(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Cloquet(hydrologic unit)

St. Louis(hydrologic accounting unit)

Western Lake Superior(hydrologic subregion)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States Minnesota St. Louis

Public Land Survey System information

Meridian Township Range Section Fraction State
4th Principal 54N 14W 24 Minnesota

Commodities

Commodity Importance
Iron Primary
Titanium, Metal Critical Primary
Copper Secondary
Nickel Critical Secondary

Materials information

Materials Type of material
Ilmenite Ore
Magnetite Ore
Pyrrhotite Ore
Pentlandite Ore
Chalcopyrite Ore
Cubanite Ore
Sphalerite Ore
Apatite Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Troctolite
    Rock unit name Boulder Lake Intrusion
    Stratigraphic age (youngest) Mesoproterozoic
    Stratigraphic age (youngest) Mesoproterozoic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite

Nearby scientific data

(1) -92.17686, 47.06832
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description The emplacement of OUIs (oxide-rich ultramafic intrusions) is along fault zones.

Ore body information

  • General form STRATIFORM

Comments on the geologic information

  • THE DULUTH COMPLEX IS A LARGE, COMPOSITE THOLEIITIC MAFIC INTRUSION THAT WAS EMPLACED INTO COMAGMATIC FLOOD BASALTS ALONG A PORTION OF THE MIDDLE PROTEROZOIC (1.1 GA, KEWEENAWAN) MIDCONTINENT RIFT SYSTEM.

Economic information about the deposit and operations

Commodity type Metallic
Significant No

Mining district

District name Western Margin Duluth Complex

Comments on the reserve resource information

  • ALONG THE WESTERN MARGIN OF THE DULUTH COMPLEX, OXIDE MINERALIZATION CONTAINS 245 MILLION TONS OF MATERIAL HAVING 10 PERCENT OR GREATER TIO2.

Comments on development

  • WINCHELL (1897) REPORTED THAT THE TITANIFEROUS IRON ORES OF THE DULUTH COMPLEX WERE DISCOVERED ABOUT 1867, ABOUT THE SAME TIME AS THE MESABI RANGE IRON ORES.

Reference information

Bibliographic references

  • Deposit

    HAUCK, S.A., SEVERSON, M.J., ZANKO, L., BARNES, S-J., MORTON, P., ALMINAS, H., FOORD, E.E., AND DAHLBERG, E.H., IN PRESS [1996], AN OVERVIEW OF THE GEOLOGY AND OXIDE, SULFIDE AND PLATINUM-GROUP ELEMENT MINERALIZATION ALONG THE WESTERN AND NORTHERN CONTACTS OF THE DULUTH COMPLEX: GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPER

  • Reserve-Resource

    HAUCK AND OTHERS, IN PRESS.

General comments

Subject category Comment text
Deposit HAUCK AND OTHERS NOTES THAT THREE TYPES OF OXIDE MINERALIZATION OCCUR IN THE DULUTH COMPLEX: 1) OXIDE-RICH METASEDIMENTARY INCLUSIONS IN MAFIC OR ULTRAMAFIC ROCKS THAT EXHIBIT METASEDIMENTARY TEXTURES AND (OR) CAN BE TRACED LATERALLY INTO FOOTWALL IRON FORMATION; 2) BANDED OR LAYERED OXIDE SEGREGATIONS THAT INCLUDE CUMULUS OXIDE-RICH HORIZONS; AND 3) LATE DISCORDANT OXIDE-BEARING ULTRAMAFIC PIPES AND BODIES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-96 Sutphin, David M. (Cannon, W. F.) 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

Beyond USGS

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

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