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  3. Mineral Resource Data System (MRDS)

Gratiot Lake Project

Prospect in Keweenaw county in Michigan, United States with commodity Copper
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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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10310107
MRDS ID LW00107
Record type Site
Current site name Gratiot Lake Project

Geographic coordinates

Geographic coordinates: -88.18643, 47.35806 (WGS84)
Relative position HOUGHTON TOWNSHIP

Site location context

Political divisions (FIPS codes)

Keweenaw(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bruneau Creek(quadrangle 1:24,000 scale)

Hancock(quadrangle 1:100,000 scale)

Hancock C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Keweenaw Peninsula(hydrologic unit)

Southcentral Lake Superior(hydrologic accounting unit)

Southern Lake Superior(hydrologic subregion)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States Michigan Keweenaw

Public Land Survey System information

Meridian Township Range Section Fraction State
Michigan 57N 31W 12 NE Michigan

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcocite Ore

Mineral occurrence model information

Model code 96
USGS model code Unassigned
Deposit model name Native Cu
Mark3 model number 99

Host and associated rocks

  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Portage Lake Volcanics
    Rock description Portage Lake Volcanics
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) Portage Lake Volcanics
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Syncline

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • ALTERNATE BRECCIATED BASALT FLOWS, AMYGDALOIDAL BASALTS AND/OR INTERFLOW CONGLOMERATES - VARIES WITH LOCATION

Economic information about the deposit and operations

Operation type Underground
Development status Prospect
Commodity type Metallic
Significant No
Year of first production 1853

Mining district

District name Keweenaw Copper District

Ownership information

  • Type Owner
    Owner Keweenaw Copper Co.,
  • Type Operator
    Owner Great Lakes Minerals

Comments on the workings information

  • PORTAL OPENED - PORJECT STOPPED/ABANDONED IN 1996

Comments on development

  • PROJECT STOPPED IN DEC 1996, ABANDONED AND CLOSED UP

Reference information

Bibliographic references

  • Deposit

    JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, P. 131-32, SITE ID # 420035, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-AUG-2002 Anderson, Arlene (M. Gere) Michigan Department of Natural Resources

Beyond USGS

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

Maps centered on this site