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Ergo Division Ergo

Producer in South Africa with commodities Gold, Silver, Sulfur, Uranium
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Geologic information

Identification information

Deposit ID 10183432
MRDS ID W032354
MAS/MILS ID 7910200133
Record type Site
Current site name Ergo Division Ergo
Alternate or previous names Ergo
Related records 10080862

Geographic coordinates

Point of reference Plant
Geographic coordinates: 28.39315, -26.2883 (WGS84)
Elevation 1858
(click for info)

Geographic areas

Country
South Africa

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Sulfur Secondary
Uranium Secondary

Nearby scientific data

Plant (1) 28.39315, -26.2883
ListMap

Economic information

Economic information about the deposit and operations

Operation type Surface
Development status Producer
Commodity type Both metallic and non-metallic
Significant Yes
Year of first production 1978
Milling method Flotation

Ownership information

  • Type Owner-Operator
    Owner East Rand Gold And Uranium Co. Ltd (Ergo)
    Interest 100

Reserves and resources

  • Type In-situ
    Estimate year 1982
    Demonstrated 220,000,000mt ore
    Indicated 220,000,000mt ore
    Total resources 220,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.57 g/mt Gold Major 1982
    Silver Ag 0.057 g/mt Silver Minor 1982
    Uranium U3O8 38.9 wt-pct Uranium Minor 1982
    Sulfur S 0.917 wt-pct Sulfur Minor 1982
  • Type In-situ
    Estimate year 1982
    Demonstrated 260,000,000mt ore
    Indicated 260,000,000mt ore
    Total resources 260,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.37 g/mt Gold Major 1982
    Silver Ag 0.037 g/mt Silver Minor 1982
    Uranium U3O8 51.4 wt-pct Uranium Minor 1982
  • Type In-situ
    Estimate year 1993
    Demonstrated 629,000,000mt ore
    Total resources 629,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.4 g/mt Gold Major 1993

Comments on the reserve resource information

  • THIS IS THE ORIGINAL ERGO DUMP RETREATMENT OPERATION WHICH WAS ANALYZED FOR THE OLD 1983 AU STUDY. 1989 PROD.= 379,571 OZ AU FROM TREATING 37,466,360 MT TAILINGS. NOT UPDATED FOR THE 1992 AU AVAILABILITY STUDY (ONLY DID MAJOR UG OPERATING MINES). 1990 PROD.= 377,196 OZ AU FROM TREATING 38,374,000 MT TAILINGS.
  • RESOURCES CONSIST OF THE CONTENTS OF 24 TAILINGS DAMS TO WHICH ERGO EITHER OWNS OR HAS RIGHTS. THE RESOURCES SHOWN ARE DIVIDED INTO TWO GRADE CATEGORIES FOR THE PURPOSE OF ANALYSIS. MINING CONSISTS OF HYDRAULICKING THE TAILINGS INTO SUMPS FOR PUMPING TO A CENTRALIZED PLANT. IT IS PLANNED TO MINE THREE DAMS SIMULTANEOUSLY THROUGHOUT THE LIFE OF THE RE- SOURCE. BENEFICIATION INCLUDES FIRST FLOTATION FOLLOWED BY PRO- CESSES TO RECOVER THE COMMODITIES. URANIUM IS RECOVERED FIRST BY SULFURIC ACID LEACHING. THE RESIDUE FROM THIS LEACHING IS ROASTED TO PRODUCE SULFURIC ACID, AND THE CALCINE RESIDUE IS THEN TREATED BY CYANIDATION AND ZINC PRECIPITATION TO PRODUCE A GOLD/SILVER BULLION. BULLION IS SENT TO THE RAND REFINERY AND THE URANIUM (AMMONIUM DI- URANATE) AND SULFURIC ACID ARE SOLD FOB PLANT.

Workings at the site

  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method HYDRAULICKING
    Capacity 53350
    Capacity Units MT ORE/DAY
    Unit Production Cost .59
    Units of Production $/MT ORE
    Operating Days per Year 360
    Operating Shifts per Day 3
    Year of Information 1981

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910200133
USGS Mineral Resources Data System MRDS W032354 MAS references MRDS

Bibliographic references

  • Reserve-Resource

    AME MINERAL ECONOMICS QUARTERLY MINE ANALYSIS, JUN 93,P. 32.

  • Deposit

    CHADWICK, J.R., ERGO - GOLD TAILINGS RECLAMATION AND RE-

  • Deposit

    TREATMENT, WORLD MINING, JUNE, 1980, PP 48-52.

  • Deposit

    ENG. & MIN. JOUR., TAILING RECLAMATION: NEW PROFITS FOR ERGO

  • Deposit

    AND OTHERS, NOVEMBER, 1982, PP 132-134.

  • Deposit

    COAL, GOLD AND BASE MINERALS OF SOUTH AFRICA, ERGO HEADS

  • Deposit

    TOWARD 1978 PRODUCTION DATE, JUNE, 1977, PP 27-28.

  • Deposit

    ERGO, 1978, 1979 AND 1981, COMPANY ANNUAL REPORTS.

  • Deposit

    FINANCIAL MAIL (MINING SUPPLEMENT), MINING THE DUMPS, JULY

  • Deposit

    28, 1978, PP 36-38.

  • Deposit

    ENG. & MIN. JOUR., THIS MONTH IN MINING, ANGLO AMERICAN

  • Deposit

    STARTS WORK ON EAST WITWATERSRAND TAILING DAM PROJECT,

  • Deposit

    JANUARY, 1977, PP 129-130.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1994 Boyle, Ed U.S. Bureau of Mines