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Carr Boyd Rocks, Austrlia

Past Producer in Western Australia, Australia with commodities Nickel, Copper, Iron
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Geologic information

Identification information

Deposit ID 10079596
MRDS ID W029634
Record type Site
Current site name Carr Boyd Rocks, Austrlia

Geographic coordinates

Geographic coordinates: 121.63253, -30.0628 (WGS84)
Relative position 80 KM NNE OF KALGOORLIE , 32 KM FROM SCOTIA DEPOSIT , 32 KM FROM SCOTIA DEPOSIT
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Geographic areas

Country State
Australia Western Australia

Commodities

Commodity Importance
Nickel Primary
Copper Secondary
Iron Tertiary

Comments on the commodity information

  • IN THE AUSTRALIAN SULFIDE DEPOSITS THE MAJOR PRIMARY ORE MINERAL IS PENTLANDITE WHICH IS GENERALLY ASSOCIATED WITH NICKELLIFEROUS PYRRHOTITE. IN MOST DEPOSITS THIS PRIMARY ASSEMBLAGE HAS BEEN ALTERED TO A VIOLARITE-PYRITE ASSEMBLAGE IN THE ZONE DOWN TO ABOUT 200 M BELOW SURFACE. VARYING AMOUNTS OF CHALCOPYRITE AND OTHER COPPER-BEARING SULFIDES ACCOMPANY THE NICKEL-IRON SULFIDES. THE NICKEL-COPPER RATIO VARIES BETWEEN ABOUT 3:1 AND 60:1.

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore
Pyrite Ore
Biotite Gangue
Hornblende Gangue
Olivine Gangue
Plagioclase Gangue

Analytical data

Result ORE SHOOT 1:1.47 % N1, 0.6 % CU, ORE SHOOT 2:1.47 % N1, 0.6 % CU, ORE SHOOT 3:1.97 % N1, 0.49 % CU

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock
    Rock unit name Basic And Acid Extrusive Rocks, Dike Rocks, Plutonic Rocks
    Rock description Basic And Acid Extrusive Rocks, Dike Rocks, Plutonic Rocks
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Troctolite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Anorthosite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock

Nearby scientific data

(1) 121.63253, -30.0628
ListMap

Geologic structures

Type Description Terms
Regional Yilgarn Archaean Block Of The Western Australian Shield
Local A E-N-E Trending Zone Include The Ore Shoots

Comments on the geologic information

  • THE ORE DEPOSITS ARE INTRUSIVE BRECCIA PIPES OF BONZITE-SULFIDE PEGATOID IN ROCKS OF A LAYERED MAFIC-ULTRAMAFIC COMPLEX. THE COMPLEX INTRUDES ARCHAEAN BASIC VOLCANICS, ACID VOLCANICS AND SEDIMENTS. ULTRAMAFIC ROCKS ARE CONCENTRATED ON THE WESTERN SOUTHERN AND EASTERN MARGINS. THE ORE DEPOSITS ARE SITUATED NEAR THE WESTERN EDGE OF THE COMPLEX. THREE SEPARATE SHOOTS OF ORE HAVE BEEN FOUND WITHIN A ZONE OF PEGMATOID INTRUSION.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1968
Discoverer Great Boulder Geologist
Discovery method Geophysical Anomaly
Year of first production 1973

Ownership information

  • Type Owner
    Owner Great Boulder Mines Ltd (51 %), North Kalgurli Mines (49 %)

Production statistics

  • Year 1974
    Period 1973 To 1974
    Material CONC
    Accuracy Accurate
    Description Cp_Grade: ^9.8 % Ni
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Nickel Nickel 10wt-pct
  • Year 1975
    Period 1974 To 1975
    Material CONC
    Accuracy Accurate
    Description Cp_Grade: ^9.3 % Ni
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Conc. Nickel Nickel 9wt-pct

Comments on the production information

  • PRODUCTION AT FIMISTON PLANT;

Reserves and resources

  • Type In-situ
    Estimate year 1973
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 1.6 wt-pct Nickel Major 1973
  • Type In-situ
    Estimate year 1973
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 0.7 wt-pct Nickel Major 1973
  • Type In-situ
    Estimate year 1974
    Total resources 1,536,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 1.34 wt-pct Nickel Major 1974
    Copper Cu 0.45 wt-pct Copper Minor 1974
  • Type In-situ
    Estimate year 1974
    Total resources 793,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 1.61 wt-pct Nickel Major 1974
    Copper Cu 0.05 wt-pct Copper Minor 1974
  • Type In-situ
    Estimate year 1974
    Total resources 45,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 0.74 wt-pct Nickel Major 1974
  • Type In-situ
    Estimate year 1975
    Total resources 1,244,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Nickel Ni 1.3 wt-pct Nickel Major 1975

Comments on the reserve resource information

  • { 1) RESERVES (PROVED AND PROBABLE) { 2) ADDITIONAL LOW GRADE RESERVE { 3) MASSIVE SULFIDE ORE { 4) CONSIDERED TO BE SUBMARGINAL

Comments on the workings information

  • A SUB-LEVEL STOPING METHODE WAS IN USE. SOME ORE WAS MINED BY GLORY HOLE EXTENDING FROM SURFACE TO NO. 1 LEVEL.

Comments on development

  • ECON.COM: DUE TO A COMBINATION OF MINING PROBLEMS AND SHORTAGE OF SKILLED LABOUR THE MINE DID NOT REACHED THE PLANNED LEVEL. PRODUCTION WAS SUSPENDED FROM JUNE, 17.1975

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W029634

Bibliographic references

  • Deposit

    AUSTR. MINER: JAN.1974 P. 14 & AUG. 1973,P.3

  • Deposit

    SCHULTZ K.: CARR-BOYD ROCKS NICKEL-COPPER DEPOSITS (ECONOMIC GEOL. OF AUSTRALIA AND PAPUA NEW GUINEA - 1.METALS, 1975, P. 125

  • Deposit

    ENGINEERING AND MINING JOURNAL-ACTIVITY DIGEST, 10/7/74, P. 8

  • Deposit

    METALS WEEK METALS SOURCEBOOK 7/2/73 ITEM # A3200

  • Deposit

    5) AMERICAN METAL MARKET 10/25/74

  • Deposit

    6) SKINNER, WALTER R., 1973, MINING INTERNATIONAL YEARBOOK: THE FINANCIAL TIMES, LONDON, 1973, P 280

  • Deposit

    7) METAL WEEK-METALS SOURCEBOOK 11/25/74, ITEM # B5214

  • Production

    AUSTR. MIN. INDUSTRY, REVIEW 1973, ,1974,1975;

General comments

Subject category Comment text
Deposit GREAT BOULDER CONVERTED ITS DISUSED GOLD TREATMENT PLANT AT FIMISTON TO NICKEL CONCENTRATOR. IN FEBR. 1970 THE FIRST ORE WAS TRANSPORTED BY ROAD FROM SCOTIA.
Deposit { THREE SEPARATE ORE SHOOTS: 1 2 3 { MAX THICKNESS 10 M 10 M 12 M { DEPTH TO BOTTOM 200 M 120 M 60 M { MAX LENGTH 70 M 50 M 70 M

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1977 Saam, Henning G. (Shaffer, Glenn L.) U.S. Geological Survey