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Boulder Lake--North

Unknown in St. Louis county in Minnesota, United States with commodities Iron, Titanium, Metal, Copper, Nickel
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Geologic information

Identification information

Deposit ID 10082828
MRDS ID W062182
Record type Site
Current site name Boulder Lake--North
Alternate or previous names Grid IV

Geographic coordinates

Geographic coordinates: -92.1524, 47.09749 (WGS84)
Location accuracy 1000(meters)
Relative position Est Location Taken From 1:250,000 Scale Map, Est Location Taken From 1:250,000 Scale Map
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Geographic areas

Country State County
United States Minnesota St. Louis

Public Land Survey System information

Meridian Township Range Section Fraction State
4th Principal 53N 14W 7 Minnesota

Commodities

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

Materials information

Materials Type of material
Ilmenite Ore
Magnetite Ore
Chalcopyrite Ore
Cubanite Ore
Pentlandite Ore
Pyrrhotite 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 > Mafic Intrusive Rock > Anorthosite
    Rock unit name Boulder Lake Intrusion
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite

Nearby scientific data

(1) -92.1524, 47.09749
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Geologic structures

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

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

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

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W062182

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