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

Franklin Junior Mine

Past Producer in Houghton 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. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  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 10082865
MRDS ID W062228
Record type Site
Current site name Franklin Junior Mine
Alternate or previous names Albany and Boston, Peninsula

Comments on the site names

  • IN 1894, THE FRANKLIN MINE PURCHASED THE FRANKLIN JUNIOR MINE. FRANKLIN JUNIOR WAS ONCE KNOWN AS ALBANY AND BOSTON AND LATER AS PENINSULA.

Geographic coordinates

Geographic coordinates: -88.52588, 47.17972 (WGS84)

Site location context

Political divisions (FIPS codes)

Houghton(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hancock(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
55N 33W 8 Michigan

Comments on the location information

  • SHAFT NO. 1

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • COPPER ARSENIDE MINERALS OCCUR WITH NATIVE COPPER IN FISSURES THAT CROSS-CUT NATIVE COPPER DEPOSITS.
  • THE PEWABIC LODE WAS OPENED BY FOUR SHAFTS, BUT MOST OF THE OPERATIONS WERE CONDUCTED FROM THE NO. 1 SHAFT, WHICH EXTENDED TO THE 37TH LEVEL. NO. 3 SHAFT GOES TO THE 15TH LEVEL. THE LODE WAS OPENED FOR ABOUT 3,800 FT ALONG STRIKE, BUT MOST OF THE DEVELOPMENT WAS WITHIN 1,500 FT NORTH AND 1,000 FT SOUTH OF THE NO. 1 SHAFT. THE ALLOUEZ CONGLOMERATE WAS OPENED AT THE FRANKLIN JR. MINE BY TWO SHAFTS. THE OPENINGS EXTEND 2,500 FT ALONG STRIKE AND WITHIN MOST OF THIS AREA THE GROUND HAS BEEN STOPED. THE STOPE MAP SUGGESTS THAT THE MAIN ORE SHOOT IN THIS AREA PINCHES OUT TO THE SOUTH. ALBANY AND BOSTON MINE WORKED THE PEWABIC AMYGDALOID IN 1862-63. ABOUT 1864 THE ALLOUEZ CONGLOMERATE WAS WORKED. ALL PRODUCTION FROM PENINSULA MINE (1883-1892) WAS FROM THE ALLOUEZ CONGLOMERATE.

Materials information

Materials Type of material
Copper Ore
Feldspar Gangue
Epidote Gangue
Quartz Gangue
Calcite Gangue

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 Pewabic Amygdaloid
    Rock description Pewabic Amygdaloid
    Stratigraphic age (youngest) Stenian
    Chronological age 1095
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
    Rock unit name Allouez Conglomerate
    Rock description Allouez Conglomerate
    Stratigraphic age (youngest) Stenian
    Chronological age 1095
  • Host or associated Host
    Rock type
    Rock unit name Portage Lake Volcanics
    Rock description Portage Lake Volcanics
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) -88.52588, 47.17972
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Felsic conglomerate

Ore body information

  • General form TABULAR

Controls for ore emplacement

  • Conglomerate bed between amygdaloid basalt flows

Comments on the geologic information

  • THE ALLOUEZ CONGLOMERATE IS VERY SIMILAR TO THE FELSITIC PORTION OF THE CALUMET AND HECLA CONGLOMERATE, THOUGH MUCH MORE PERSISTENT AND OVER CONSIDERABLE AREAS MUCH THICKER. IT IS LENTICULAR, HOWEVER, IN PLACES PINCHING OUT COMPLETELY OR REPRESENTED ONLY BY A THIN CLAY SEAM.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1862
Year of last production 1911
Production years 1862-1878 INTRMITTENTLY AS THE ALBANY AND BOSTON MINE; 1883-92 AS PENINSULA MINE; PURCHASED BY FRANKLIN MINING CO. ON 1894.

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Franklin Mining Co.

Production statistics

  • Year 1878
    Period 1862-1878
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 399mt
  • Year 1892
    Period 1883-1892
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 3005mt

Comments on the production information

  • 399 MT PRODUCED FROM ALBANY AND BOSTONE MINE. 3,005 MT PRODUCED FROM PENINSULA MINE. PRODUCTION FOR FRANKLIN JR. MINE AFTER 1892 IS INCLUDED IN FIGURES FOR FRANKLIN MINE. PRODUCTION FROM THE PEWABIC LODE AND THAT FROM THE CONGLOMERATE LODE IN THE FRANKLIN JR. MINE WERE NOT SEPARATELY RECORDED PART OF THE TIME. AFTER THE CLOSING OF THE CONGLOMERATE LODE IN 1909, THE PEWABIC LODE PRODUCED ABOUT 16 MILLION LBS OF COPPER. DURING THIS PERIOD, THE YIELD WAS ABOUT 9 TO 12 LBS OF COPPER/ TON OF ROCK.

Reference information

Bibliographic references

  • Deposit

    BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF PAPER NO. 144, 238 PP.

  • Deposit

    CORNWALL, H.R., AND WRIGHT, J.C., 1956, GEOLOGIC MAP OF THE HANCOCK QUADRANGLE, MICHIGAN: USGS MAP MF-46, SCALE 1:24000

  • Production

    BUTLER, B.S., AND BURBANK, W.S., 1929, P. 77, 93.

General comments

Subject category Comment text
Deposit PEWABIC (OR QUINCY) AMYGDALOID

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1996 Sutphin, D.M. (Cannon, W.F.) 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