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Baltic Amygdaloid

Past Producer 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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  17. Production statistics
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10106398
MRDS ID W060038
Record type Deposit
Current site name Baltic Amygdaloid
Alternate or previous names Baltic Lode, Baltic Amygdaloid Lode
Related records 10121577

Comments on the site names

  • NORTH OF THE ATLANTIC SECTION 16 MINE SHAFT THE SUPERIOR AND WEST AMYGDALOIDAL LODES ARE BELIEVED TO BE NORTHERN EXTENSIONS OF THE BALTIC LODE.. IN HOUGHTON COUNTY, THE BALTIC AMYGDALOID LODE WAS WORKED BY THE BALTIC MINING COMPANY (6 SHAFTS), THE TRIMOUNTAIN MINING COMPANY (4 SHAFTS) AND THE CHAMPION COPPER COMPANY (5 SHAFTS). FURTHER SOUTH, THE BALTIC LODE WAS EXPLORED BY THE GLOBE MINING COMPANY AND THE CHALLENGE MINING COMPANY EACH WITH ONE SHAFT. TO THE NORTH THE ATLANTIC SECTION 16 SHAFT WAS ON THE BALTIC LODE.

Geographic coordinates

Geographic coordinates: -88.63423, 47.06528 (WGS84)

Site location context

Political divisions (FIPS codes)

Houghton(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

South Range(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
054N 034W 21 SE 4 OF NW 4 Michigan

Comments on the location information

  • LOCATION CHOSEN AS THE NO. 3 SHAFT IN THE BALTIC MINE. LAT/LON IS FOR THE ORE BODY

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Copper Ore
Quartz Gangue
Pumpellyite-(Mg) Gangue
Epidote Gangue
Calcite Gangue
Arsenical Copper Gangue
Chalcocite Gangue

Alteration

  • (Local) Oxidized and bleached

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) -88.63423, 47.06528
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Broad anticline

Ore body information

  • General form LODE

Comments on the geologic information

  • THE BALTIC AMYGDALOID LODE IS A RELATIVELY THICK (150 - 200 FEET THICK), DENSE, DARK BASALT WITH A WELL-DEVELOPED FLOWTOP BRECCIA. ALTHOUGH WELL OXIDIZED, THE LODE IS NOT AS THOROUGHLY OXIDIZED AS THE KEARSARGE LODE. AN ABUNDANCE OF IRON-RICH CARBONATES IN THE MINERALIZED PORTIONS OF THE LODE GIVE THE OXIDIZED ROCKS A BROWNISH CAST. COPPER SULFIDE AND ARSENIDES ARE FOUND IN FISSURES CUTTING THE LODE. THE BALTIC LODE WAS THE SECOND MOST PRODUCTIVE LODE (AFTER THE KEARSARGE).

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Deposit size Large
Significant Yes
Year of first production 1898
Production years AT LEAST THROUGH 1925 BUT NOT LATER THAN 1968

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Copper Range Co.
    Interest 100
    Home office Michigan
    Year 1978

Production statistics

  • Year 1967
    Period 1898-1967
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 8367614mt

Comments on the production information

  • Ore graded 1.50 % Cu.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit THE BALTIC AMYGDALOID IS 150-200 FEET THICK IN THE VICINITY OF THE BALTIC, TRIMOUNTAIN AND CHAMPION MINES BUT THINS CONSIDERABLY TO NORTH AND SOUTH. CORRELATIONS DIFFICULT AWAY FROM MAIN MINE AREAS. HORIZON HAS BEEN SEEN AT GLOBE PROSPECT.

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
Updater 02-APR-2004 Woodruff, Laurel G. U.S. Geological Survey
Editor 10-JUN-2009 Nicholson, Suzanne U.S. Geological Survey

Beyond USGS

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

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