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Unisel/Jurgenshof/Tarkwa

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

Identification information

Deposit ID 10183326
MRDS ID W031000
MAS/MILS ID 7910150011
Record type Site
Current site name Unisel/Jurgenshof/Tarkwa
Alternate or previous names Unisel
Related records 10080049

Geographic coordinates

Point of reference Claim
Geographic coordinates: 26.80149, -28.04654 (WGS84)
Elevation 1350
Location accuracy 1000(meters)
(click for info)

Geographic areas

Country State
South Africa Free State

Commodities

Commodity Importance
Gold Primary
Silver Secondary
Sulfur Tertiary
Uranium Tertiary

Materials information

Materials Type of material
Gold Unknown
Pyrite Unknown
Quartz Unknown
Silver Unknown

Nearby scientific data

Claim (1) 26.80149, -28.04654
ListMap

Ore body information

  • Strike N37W
    Dip 20E
    Thickness 2M
    Depth to top 1800M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STRATIFORM
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Strike And Dip N37W
    Minimum Depth to Top 1250
    Date of Last Modification 851226
  • Strike N37W
    Dip 20E
    Thickness 1.9M
    Depth to top 1800M
    Field Value
    MAS Matrix # 2
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STRATIFORM
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Strike And Dip N37W
    Minimum Depth to Top 1250
    Date of Last Modification 851226
  • Strike N37W
    Dip 20E
    Thickness 1.9M
    Depth to top 1800M
    Field Value
    MAS Matrix # 3
    MAS Column # 1
    Type of Orebody #1 SEDIMENTARY
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STRATIFORM
    Primary mode of Origin SEDIMENTATION
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. NONE
    Strike And Dip N37W
    Minimum Depth to Top 1250
    Date of Last Modification 851226
  • Area 450HA
    Field Value
    Total Surface Area (HA) 450
    Date of Last Modification 910418

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Producer
Commodity type Both metallic and non-metallic
Deposit size Large
Significant Yes
Discovery year 1973
Year of first production 1979
Milling method Carbon-In-Pulp-Electrowin

Mining district

District name Orange Free State Gold Fields

Mineral rights holdings

Type of mineral rights Federal Lease

Ownership information

  • Type Owner-Operator
    Owner Unisel Gold Mines Ltd.
    Interest 100
    Home office South Africa
    Year 1982

Production statistics

  • Year 1979
    Description 194000 Mt Of Ore Milled/Yr
  • Year 1980
    Description 920000 Mt Of Ore Milled/Yr
  • Year 1981
    Description 1071000 Mt Of Ore Milled/Yr

Comments on the production information

  • DORE BULLION IS TRUCKED FROM ST. HELENA MILL TO RAND REFINERY, IN GERMISTON, S. AFRICA, FOR REFINING. REFINERY CHARGE IS INCLUDED IN SMELTING COST.

Reserves and resources

  • Type In-situ
    Estimate year 1993
    Demonstrated 1,780,000mt ore
    Total resources 1,780,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.5 g/mt Gold Major 1993

Comments on the reserve resource information

  • Q-MAT 1 = BASAL REEF. Q-MAT 2 = LEADER REEF. Q-MAT 3 = MIDDLE REEF. M4C1=M1C1+M2C1+M3C1. TOTAL DEMONSTRATED RESOURCES, AS OF 1982, IS 2.4 M MT.
  • 1989 AU PRODUCTION = 202,678 OZ FROM TREATING 1,053,027 MT ORE. WAS UPDATED FOR THE 1992 AU AVAILABILITY STUDY. 1991 AU PRODUCTION = 142,945 OZ FROM TREATING 730,000 MT ORE. 1992 ADIT RESERVES ONLY FOR UNISEL/JURGENSHOF FARMS (TARKWA FARM NOT INCLUDED).
  • G-REC 1 = BASAL REEF; 79% OF DEMONSTRATED RESOURCES. G-REC 2 = LEADER REEF; 10% OF DEMONSTRATED RESOURCES. G-REC 3 = MIDDLE REEF; 10% OF DEMONSTRATED RESOURCES.

Workings at the site

  • Type of workings Underground
    Overall depth 2200M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method BREAST STOPING 10-30
    Percent Waste Rock 0
    Percent Recovery 100
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Number of Shafts 1
    1st Condition of Workings OPEN
    Capacity 3143
    Capacity Units MT ORE/DAY
    Unit Production Cost 36.91
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1982
  • Type of workings Underground
    Overall depth 2200M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 2
    Status of Mining Method ACTUAL
    Mining Method BREAST STOPING 10-30
    Percent Waste Rock 0
    Percent Recovery 100
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Number of Shafts 1
    1st Condition of Workings OPEN
    Capacity 3714
    Capacity Units MT ORE/DAY
    Unit Production Cost 36.91
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1982

Comments on other economic factors

  • 94% OF TOTAL ST. HELENA MILL CAPACITY WAS USED IN 1982; 100%, IN 1984. UNISEL ORE ACCOUNTED FOR 32-38% OF MILL CAP. ORE IS RAILED TO ST. HELENA MILL; TOLL CHARGE OF $2.08/MT (1981$), IS INCLUDED IN MILL OP. COST.
  • THIS PROPERTY WAS DEVELOPED BY ST HELENA MINING OPERATION (SEQ. NO. 791-015-0007), BECAUSE THE INITIAL RESERVE WAS NOT SUFFICIENT TO JUSTIFY A SEPARATE MINING OPERATION. THUS, UNISEL ORE IS TREATED AT ST. HELENA MILL. 1ST HALF OF MINE LIFE - STOPING BETWEEN 1345-1885 M DEPTH 2ND HALF OF MINE LIFE - STOPING BETWEEN 1859-2150 M DEPTH EXPAND CAPACITY, FROM 1.1 M MTPY TO 1.3 M MTPY, IN 1984.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 7910150011
USGS Mineral Resources Data System MRDS W031000 MAS references MRDS

Bibliographic references

  • Geology

    ANHAEUSSER, C.R. 1976, THE NATURE AND DISTRIBUTION OF

  • Geology

    ARCHAEN GOLD MINERALIZATION IN SOUTHERN AFRICA. MINERALS

  • Geology

    SCI. ENGNG., V. 8, NO. 1, PP. 46-84.

  • Geology

    BOYLE, R.W. 1979, THE GEOCHEMISTRY OF GOLD AND IT'S

  • Geology

    DEPOSITS. GEOLOGICAL SURVEY OF CANADA, BULL. 280, 584 PP.

  • Geology

    HAUGHTON, S.H., ED. 1964A, THE GEOLOGY OF SOME ORE

  • Geology

    DEPOSITS IN SOUTHERN AFRICA. V. 1, GOLD DEPOSITS OF THE

  • Geology

    WITWATERSRAND BASIN. GEOL. SOC. S. AFRICA, JOHANNESBURG,

  • Geology

    625 PP.

  • Geology

    LIEBENBERG, W.R. 1972, MINERALOGICAL FEATURES OF GOLD

  • Geology

    ORES IN SOUTH AFRICA. PUBLISHED IN GOLD METALLURGY IN SOUTH

  • Geology

    AFRICA, EDITED BY R.J. ADAMSON. CHAMBER OF MINES OF S. AFR.

  • Geology

    MINTER, U.E.L. 1976, DETRITAL GOLD, URANIUM, AND PYRITE

  • Geology

    CONCENTRATIONS PILATED TO SEDIMENTOLOGY IN THE PRECAMBRIAN

  • Geology

    VAAL REEF PLACER, WITWATERSRAND, SOUTH AFRICA. ECONOMIC

  • Geology

    GEOLOGY, V. 71, PP. 157-176.

  • Geology

    PRETORIUS, D.A. 1981, GOLD AND URANIUM IN QUARTZ-PEBBLE

  • Geology

    CONGLOMERATES. ECONOMIC GEOLOGY 75TH ANNIVERSARY VOLUME,

  • Geology

    PP. 117-138.

  • Geology

    PRETORIUS, D.A. 1975, THE DEPOSITIONAL ENVIRONMENT OF

  • Geology

    THE WITWATERSRAND GOLDFIELDS. A CHRONOLOGICAL REVIEW OF

  • Geology

    SPECULATIONS AND OBSERVATIONS. MIN. SCI. ENGNG., V. 7,

  • Geology

    NO. 1, PP. 18-47.

  • Geology

    SMITH, N.D., AND W.E.L. MINTER. 1980, SEDIMENTOLOGICAL

  • Geology

    CONTROLS OF GOLD AND URANIUM IN TWO WITWATERSRAND PALEO-

  • Geology

    PLACERS. ECONOMIC GEOLOGY, V. 75, PP. 1-14.

  • Production

    ADAMSON, R.J. (ED.). 1972, GOLD METALLURGY IN SOUTH

  • Production

    AFRICA, CHAMBER OF MINES OF SOUTH AFRICA, 452 PP.

  • Production

    FINANCIAL TIMES. 1981, MINING INTERNATIONAL YEARBOOK

  • Production

    (SELECTED EXCERPTS).

  • Production

    KING, A.. 1949, GOLD METALLURGY ON THE WITWATERSRAND.

  • Production

    TRANSVAAL CHAMBER OF MINES, 458 PP.

  • Production

    MCQUISTON, F.W. AND R.S. SHOEMAKER. 1975, GOLD AND

  • Production

    SILVER CYANIDATION PLANT PRACTICE. SOCIETY OF MINING ENG.

  • Reserve-Resource

    ANNUAL REPORTS - VAAL REEFS EXPLORATION AND MINING

  • Reserve-Resource

    COMPANY LTD., 1981.

  • Reserve-Resource

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

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1981, RAND REFINERY,

  • Deposit

    P.R.D. SERIES NO. 255, 20PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 1980, GOLD IN SOUTH

  • Deposit

    AFRICA, P.R.D. SERIES NO. 241, 28PP.

  • Deposit

    CHAMBER OF MINES, 1980, OVERVIEW OF THE SOUTH AFRICAN

  • Deposit

    MINING INDUSTRY.

  • Deposit

    ELEVATORSKI, E.A. 1981, GOLD MINES OF THE WORLD.

  • Deposit

    PUBLISHED BY MINOBRAS, PP. 78-86.

  • Deposit

    POTTS, D. 1981, THE SOUTH AFRICAN GOLD MINING INDUSTRY,

  • Deposit

    1981. PUBLISHED BY CONSOLIDATED GOLD FIELDS, LTD., PP.17-85.

  • Deposit

    GOLD INSTITUTE. 1981, GOLD REGULATIONS AND TAXES FOR

  • Deposit

    MINING, REFINING, MANUFACTURING AND TRADE IN THIRTEEN

  • Deposit

    COUNTRIES. PP. 74-79.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA. 1982, ANALYSIS OF

  • Deposit

    WORKING RESULTS, OCTOBER-DECEMBER, 1981, 8 PP.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA. 1981, 91ST ANNUAL

  • Deposit

    REPORT AND STATISTICAL TABLES. 116 PP.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES. 1982, PRODUCTION AND

  • Deposit

    CAPITAL EXPENDITURES FOR THE SOUTH AFRICAN GOLD MINES, 1966-

  • Deposit

    1981.

  • Deposit

    MINING JOURNAL RESEARCH SERVICES. 1982, SUMMARY REPORT

  • Deposit

    OF PRODUCTION AND RECOVERY FOR THE SOUTH AFRICAN GOLD MINES,

  • Deposit

    1966-1981.

  • Deposit

    MOHIDE, T.F. 1981, GOLD MINERAL POLICY BACKGROUND PAPER

  • Deposit

    NO. 12. ONTARIO MINISTRY OF NATURAL RESOURCES, PP. 84-112.

  • Deposit

    STORRAR, C.D. 1981, SOUTH AFRICAN MINE VALUATION.

  • Deposit

    CHAMBER OF MINES OF SOUTH AFRICA, 470 PP.

Reporter information

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