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Johnston - Moffet Copper

Past Producer in Madison county in Montana, United States with commodities Copper, Silver, Gold
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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. 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. Land status
  17. Ownership information
  18. Production statistics
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10078289
MRDS ID W026551
Record type Site
Current site name Johnston - Moffet Copper
Alternate or previous names Mountain View

Geographic coordinates

Geographic coordinates: -112.18837, 45.60296 (WGS84)
Elevation 2169
Relative position 7 1/2 AIRLINE MILES NE OF TWIN BRIDGES

Site location context

Political divisions (FIPS codes)

Madison(county)

Montana(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Old Baldy Mountain(quadrangle 1:24,000 scale)

Butte South(quadrangle 1:100,000 scale)

Dillon(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Jefferson(hydrologic unit)

Missouri Headwaters(hydrologic accounting unit)

Missouri Headwaters(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Beaverhead-Deerlodge 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 Montana Madison

Public Land Survey System information

Meridian Township Range Section Fraction State
Montana Principal 003S 005W 02 Montana

Comments on the location information

  • 1 1/2 MILES UP BEAR GULCH

Commodities

Commodity Importance
Copper Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Chalcocite Ore
Chalcopyrite Ore
Chrysocolla Ore
Cuprite Ore
Malachite Ore
Diopside Gangue
Garnet Gangue
Magnetite Gangue
Pyrite Gangue

Alteration

  • (Local) Tactite Minerals And Pyritization

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Quartz Monzonite
    Rock unit name Quartz Monzonite
    Rock description Quartz Monzonite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Mississippian
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Mississippian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Madison
    Rock description Madison

Nearby scientific data

(1) -112.18837, 45.60296
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description North - Striking And Northeast - Striking Faults
Type of structure Local
Structure description North - Striking Fault May Have Exerted Structural Control On Emplacement Of Qtz Monzonite Stock.

Ore body information

  • General form IRREGULAR
    Strike N 30 W
    Dip 89 W
    Length 304.8M
    Width 15.24M
    Depth to top 0M
    Depth to bottom 71.63M

Controls for ore emplacement

  • Contact Zone Of Stock And Limestone And Alteration Of Isolated Limestone Blocks Within Intrusive To Tactite And Sulfide Minerals

Comments on the geologic information

  • ORE DEPOSITS ARE ASSOCIATED WITH TACTITE ZONES AT STOCK CONTACTS & WITHIN STOCK PROPER

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1900
Year of first production 1916

Mining district

District name Tidal Wave District

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner W. S. Moore Co. And Iso Copper

Production statistics

  • Year 1916
    Period 1916
    Material CU
    Accuracy Accurate
    Description Cp_Grade: ^2.32 % Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Copper Copper 2wt-pct
  • Year 1944
    Period 1944
    Material CU
    Accuracy Accurate
    Description Cp_Grade: ^ 0.39 Oz Ag/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Silver Silver 11wt-pct

Comments on the production information

  • NO PRODUCTION SINCE 1944

Reserves and resources

  • Type In-situ
    Estimate year 1973
    Total resources 907000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.3 wt-pct Copper Major 1973

Comments on the reserve resource information

  • THIS IS BASED ON PREVIOUSLY DESCRIBED DRILLING

Workings at the site

  • Type of workings Surface/Underground
    Length 1188.72M
    Overall depth 71.63M

Comments on the workings information

  • ORE HAS BEEN MINED FROM SURFACE CUTS. SOME SURFACE TRENCHING (430 FT) AND 10 DRILL HOLES TOTALING 1101 FT WERE DRILLED IN THE EARLY 1970'S ISO COPPER & W. S. MOORE DRILLED A NUMBER OF 200 FT PERCUSSION DRILL HOLES & OUTLINED ORE DEPOSIT

Reference information

Bibliographic references

  • Deposit

    MBMG BULL 24, P. 26-27.

  • Deposit

    ROBY, R. N., 1946 , EXPLORATION OF THE MOFFET - JOHNSTON COPPER PROPERTY, MADISON COUNTY, MONTANA: U S BUREAU OF MINES REPORT OF INVESTIGATIONS 3939 , 12 P.

  • Deposit

    1943 DIREXPL ROBY, USBM PUBLISHED REPORT

  • Deposit

    1957 COMPILE JOHNS W. M. PUBLISHED REPORT

  • Production

    ROBY, 1946 , MOFFET - JOHNSTON COPPER PROPERTY, P. 2 , 3

  • Reserve-Resource

    W. S. MOORE CO. AND ISO COPPER

General comments

Subject category Comment text
Deposit ISO COPPER PERCUSSION DRILLING, SAMPLING AND ANALYSIS INDICATE MINERALIZATION WITHIN A ZONE APPROX. 1000 FT LONG AND 50 FT WIDE AVERAGING ABOUT 1.3 PERCENT COPPER
Deposit MAXIMUM LENGTH OF ORE BODIES ARE FROM 100 TO 300 FT, BUT TACTITE ZONE IS 500 FT LONG ON SURFACE OUTCROP

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1977 Johns, Willis M.; R. B. Berg U.S. Geological Survey

Beyond USGS

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

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