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St. Louis Exploration

Prospect in Houghton 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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Reserves and resources
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10082640
MRDS ID W060078
Record type Site
Current site name St. Louis Exploration
Alternate or previous names St. Louis

Geographic coordinates

Geographic coordinates: -88.41255, 47.23056 (WGS84)
Relative position EAST OF LAURIUM, MI

Site location context

Political divisions (FIPS codes)

Houghton(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Laurium(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 Houghton

Public Land Survey System information

Meridian Township Range Section Fraction State
056N 032W 20 NE 4 OF SE 4 Michigan

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcocite Ore
Malachite Ore
Copper Ore
Quartz Gangue
Epidote Gangue
Calcite Gangue

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) Jacobsville Sandstone
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Near Keweenaw fault
Type of structure Local
Structure description Shearing

Comments on the geologic information

  • MINERALIZATION OCCURS IN TWO ZONES SEVERAL THOUSAND FEET APART; 1) IN THE ST. LOUIS AMYGDALOID, WHERE DRILL HOLE SLUDGE ASSAYS OF THREE OF THE NINE HOLES AVERAGED 0.90% CU OVER 88 FEET; AND 2) RELATED TO SHEARING IN COPPER CITY FLOW ABOVE THE ST. LOUIS CONGLOMERATE -- CORE RECOVERY WAY POOR - ASSAY OF SLUDGES HAD AN AVERAGE OF 1.39% CU OVER 172.5 FEET.

Economic information about the deposit and operations

Operation type Surface
Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1909
Discoverer St. Louis Mining Co

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Michigan Copper Company, Ltd.

Reserves and resources

  • Type In-situ
    Estimate year 1995
    Reserves 7258000
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 0.8 wt-pct Copper Major 1995

Comments on development

  • IN 1909 THE ST. LOUIS COMPANY INTERSECTED MINERALIZATION OVER A WIDE ZONE NEAR THE KEWEENAW FAULT. IN LATE 1930'S CALUMET AND HECLA CO SANK A SHAFT AND ATTEMPTED TO FOLLOW MINERALIZED SHEARS. SEVEN DRILL HOLES WERE COMPLETED IN 1937 WITHOUT DEFINITIVE RESULTS. AREA WAS TRENCHED IN 1950; THE ROCK TESTED AT THE AHMEEK MILL WAS DETERMINED TO BE LOW-GRADE.

Reference information

Bibliographic references

  • Deposit

    UNPUBLISHED REPORT BY MICHIGAN COPPER COMPANY -- TITLED 'MICHIGAN COPPER SULFIDE PROJECT, KEWEENAW PENINSULA'

  • Reserve-Resource

    MICHIGAN COPPER COMPANY REPORT

General comments

Subject category Comment text
Deposit THE PRESENCE OF SHEAR-CONTROLLED MINERALIZATION OVER A WIDE THICKNESS MAY OCCUR AT OTHER PLACES NEAR THE KEWEENAW FAULT AND OFFERS POTENTIAL FOR SURFACE DEPOSITS.

Reporter information

Type Date Name Affiliation Comment
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.

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