1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

543-S

Producer in Keweenaw county in Michigan, United States with commodity Copper
Map
XML
JSON
KML
B
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. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Reserves and resources
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10082635
MRDS ID W060073
Record type Site
Current site name 543-S

Geographic coordinates

Geographic coordinates: -88.17282, 47.35833 (WGS84)
Relative position ABOUT 1.5 MILES WEST OF LAKE GRATIOT

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 057N 031W 12 Michigan
057N 030W 7 Michigan

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcocite Ore

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 Lowermost Portage Lake volcanics flows
Type of structure Local
Structure description Deposit spatially related to cross-cutting dacite dike

Controls for ore emplacement

  • Open space fillings and replacements in amygdaloidal flow tops

Comments on the geologic information

  • The main part of the deposit is spatially related to a dacite dike (up to 60 feet thick) which crosses the strike of the flowtops at about 10 degrees and dips about 10 degrees steeper. Chalcocite is found in 4 geologic environments: 1) amygdaloid -- chalcocite fills spaces between fragments in flowtop and to some extent within the fragments themselves (most of the reserve with better grades and continuity); 2) ophitic -- chalcocite in massive flow rock as open space filling along fractures; 3) dikes -- locally vesicles filled with chalcocite; and 4) calcite -- chalcocite occurs with calcite in veins.

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1975
Discoverer Homestake Keweenaw venture

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Michigan Copper Company Ltd

Reserves and resources

  • Type In-situ
    Estimate year 1991
    Reserves 4523000
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 2.27 wt-pct Copper Major 1991

Comments on the reserve resource information

  • cut-off grade of 0.75% Cu

Reference information

Bibliographic references

  • Deposit

    MICHIGAN COPPER COMPANY LTD, 1989, MICHIGAN COPPER SULFIDE PROJECT: KEWEENAW PENINSULA : COMPANY REPORT, 21 PP.

  • Reserve-Resource

    MICHIGAN COPPER COMPANY LTD REPORT

General comments

Subject category Comment text
Deposit MICHIGAN COPPER COMPANY LTD WAS FORMED IN 1989 AS A JOINT VENTURE BETWEEN PENINSULA COPPER INDUSTRIES, INC., KEWEENAW COPPER COMPANY, AND TORCH LAKE HOLDINGS. MINE AND MILL ASSETS WERE ACQUIRED FROM HOMESTAKE KEWEENAW VENTURE (HKV)
Deposit MINERALIZATION OCCURS OVER STRIKE LENGTH OF 2000 FEET WITH GREATEST GRADE AND TONNAGE ABOVE 600 FEET OF DEPTH.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JUL-1995 Sachiko Tanikawa U.S. Geological Survey
Reporter 01-JUL-1995 Nicholson, Suzanne U.S. Geological Survey
Updater 01-MAR-1997 Sutphin, D.M. U.S. Geological Survey
Editor 01-MAY-1997 Mason Jr., G.T. 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