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Mcgregor Group

Past Producer in Custer county in Idaho, United States with commodities Silver, Lead, Copper, Gold, Fluorine-Fluorite, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Production statistics
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10069094
MRDS ID W002483
Record type Site
Current site name Mcgregor Group

Geographic coordinates

Geographic coordinates: -114.31732, 44.40929 (WGS84)
Elevation 2134
Relative position 8 MILES SW OF CHALLIS IDAHO

Site location context

Political divisions (FIPS codes)

Custer(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bayhorse(quadrangle 1:24,000 scale)

White Cloud Peaks(quadrangle 1:100,000 scale)

Challis(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Salmon(hydrologic unit)

Salmon(hydrologic accounting unit)

Lower Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Salmon-Challis National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Idaho Custer

Comments on the location information

  • 7 1/2 MIN USGS TOPO MAP BAYHORSE IS AVAILABLE

Commodities

Commodity Importance
Silver Primary
Lead Primary
Copper Secondary
Gold Secondary
Fluorine-Fluorite Critical Tertiary
Zinc Critical Tertiary

Materials information

Materials Type of material
Cerargyrite Ore
Smithsonite Ore
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Silicification Of Wall Rock

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Phyllite
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite
    Rock unit name Garden Creek Phyllite, Dark-Gray Sericitic Phyllite;Bayhorse Dolomite, Gray Dolomite With Few Beds Of Slate;Ramshorn Slate, Conglomerate Facies & Tan Argillaceous Slate;Kinnikinic Quartzite, Lavender Fine-Grained Quartzites; Pebble Conglomerates
    Rock description Garden Creek Phyllite, Dark-Gray Sericitic Phyllite;Bayhorse Dolomite, Gray Dolomite With Few Beds Of Slate;Ramshorn Slate, Conglomerate Facies & Tan Argillaceous Slate;Kinnikinic Quartzite, Lavender Fine-Grained Quartzites; Pebble Conglomerates

Nearby scientific data

(1) -114.31732, 44.40929
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Idaho Batholith
Type of structure Local
Structure description Bayhorse Anticline, Swigert Fault

Ore body information

  • General form IRREGULAR
    Strike N 40 DEG W
    Dip 40 DEG
    Plunge 5 DEG
    Plunge direction NE
    Length 121.92M
    Width 18.29M
    Depth to bottom 60.96M

Controls for ore emplacement

  • Shear And Breccia Zones In The Dolomite And Phyllite

Economic information about the deposit and operations

Development status Past Producer
Commodity type Both
Deposit size Small
Significant No
Discovery year 1870
Year of first production 1870

Mining district

District name Bayhorse District

Ownership information

  • Type Operator
    Owner Bunker Hill Co.
  • Type Owner
    Owner W. B. Swigert

Production statistics

  • Year 1911
    Period 1901 - 1911
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^74.8 Oz Ag/T, 45.6 % Pb, 0.3 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Lead Lead 46wt-pct
    Ore Copper Copper 0wt-pct
    Ore Silver Silver 2112g/mt

Comments on the production information

  • ITEM 8 IS FOR ALL RECORDED PRODUCTION FROM 1901-1911; UMPLEBY REPORTS THAT THE PACIFIC PRODUCED $65,000 PRIOR TO 1911, AND THE HOOSIER PRODUCED $70,000; CHAMBERS SAYS PACIFIC MORE THAN DOUBLED PRODUCTION AFTER 1911.

Comments on the reserve resource information

  • MCGREGOR GROUP CONTAINS LARGEST RESERVES OF FLUORSPAR IN THE BAYHORSE DISTRICT
  • RESERVES ARE MAINLY IN THE PACIFIC MINE

Workings at the site

  • Type of workings Underground
    Length 609.6M
    Overall depth 91.44M

Comments on the workings information

  • ROSS STATED THE PACIFIC ORE WAS REPLACEMENT, CHAMBERS STATED THAT THE ORE WAS IN BRECCIA ZONES CONCORDANT WITH BEDDING. DEPOSIT SIZE IS THAT OF THE PACIFIC MINE

Comments on development

  • ECON.COM: LOW GRADE ORE AND LONG DISTANCE TO SMELTER DISCOURAGE FURTHER DEVELOPMENT

Reference information

Bibliographic references

  • Deposit

    UMPLEBY, J. B., 1913, SOME ORE DEPOSITS IN NORTHWESTERN CUSTER COUNTY, IDAHO; USGS BULL. 539, P. 31-38, 64-67, 69

  • Deposit

    ROSS, C. P., 1937, GEOLOGY AND ORE DEPOSITS OF THE BAYHORSE REGION, CUSTER COUNTY, IDAHO: USGS BULL. 877, P. 148

  • Deposit

    CHAMBERS, A. E. 1966, GEOLOGY AND MINERAL DEPOSITS OF PART OF THE BAYHORSE MINING DISTRICT: UNPUBLISHED PH.D DISSERTATION, UNIV. OF ARIZONA

  • Deposit

    1913 RECON UMPLEBY, J. B.

  • Deposit

    1937 RECON ROSS, C. P.

  • Deposit

    1945 DIREXPL A. S. & R. CO., LOCATED LOW GRADE ORE

  • Deposit

    1949 DIREXPL W. B. SWIGERT & ASS., PROVED LOW GRADE ORE

  • Deposit

    1958 DIREXPL BUNKER HILL CO., NO SULFIDE DISCOVERED

  • Production

    ROSS, C. P., 1937 USGS BULL. 877

  • Reserve-Resource

    CHAMBERS, A. E., 1966, PH.D DISSERTATION U. OF ARIZONA

General comments

Subject category Comment text
Deposit CHAMBERS AND OTHERS FELT THAT THE AGE OF MINERALIZATION WAS EARLY TERTIARY RATHER THAN EARLY CRETACEOUS AS ROSS BELIEVED

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1974 Petersen, David W. U.S. Geological Survey

Beyond USGS

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

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