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  3. Mineral Resource Data System (MRDS)

Ashanti

Producer in Ashanti, Ghana with commodities Gold, Silver
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Geologic information

Identification information

Deposit ID 10081075
MRDS ID W032774
Record type Site
Current site name Ashanti
Alternate or previous names Obuasi

Geographic coordinates

Geographic coordinates: -1.64856, 6.23446 (WGS84)
Elevation 200
Relative position 150 KM NW OF ACCRA
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Geographic areas

Country State
Ghana Ashanti
Ghana Ashanti

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Galena Ore
Gold Ore
Pyrite Ore
Pyrrhotite Ore
Albite Gangue
Ankerite Gangue
Graphite Gangue
Quartz Gangue
Sericite Gangue

Analytical data

Result AVERAGE GRADE IS ABOUT 1 OZ AU/TON.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Birrimian Formation
    Rock description Birrimian Formation

Nearby scientific data

(1) -1.64856, 6.23446
ListMap

Geologic structures

Type of structure Local
Structure description Shear Runs Along Strike North To Northeast, Sub Vertical

Ore body information

  • General form LENSES
    Strike N-NE
    Dip STEEP
    Thickness 12.19M
    Length 304.8M

Controls for ore emplacement

  • Contacts Of Lower And Upper Birimian Rocks

Comments on the geologic information

  • GENERAL DESCRIPTION OF REGION

Economic information

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1893

Mining district

District name Ashanti, Obuasi

Ownership information

  • Type Owner-Operator
    Owner Ashanti Goldfields Corp. Ltd.

Production statistics

  • Year 1978
    Material AU ORE
    Accuracy Accurate
    Description Ap_Grade: ^7.5 D/T Percent
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Gold Gold 8g/mt

Reserves and resources

  • Type In-situ
    Estimate year 1978
    Commodity Subtype Grade units Group Importance Year
    Gold Au 7.5 g/mt Gold Major 1978
  • Type In-situ
    Estimate year 1986
    Total resources 6,200,000,000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 15 g/mt Gold Major 1986

Comments on the workings information

  • TEN SHAFTS; CAVING; SQUARE SET CUT AND FILL

Comments on development

  • ECON.COM: MINE, CONCENTRATOR

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS W032774

Bibliographic references

  • Deposit

    DEKUN, NICOLAS, 1965, MINERAL RESOURCES OF AFRICA: ELSEVIER PUB. CO., AMSTERDAM, 740 P.

  • Deposit

    MM 1980; E/MJ 1978; WAR MINERALS REPORT 1976-1977

  • Deposit

    MINING MAGAZINE, JANUARY, 1987, P. 75.

  • Deposit

    BOYLE, R.W., 1979, THE GEOCHEMISTRY OF GOLD AND ITS DEPOSITS (TOGETHER WITH A CHAPTER ON GEOCHEMICAL PROSPECTING FOR THE ELEMENT): GEOLOGICAL SURVEY OF CANADA BULLETIN 280, 584 P.

  • Deposit

    KESSE, G.O., 1984, THE OCCURRENCE OF GOLD IN GHANA, IN FOSTER, R.P., ED., GOLD '82: THE GEOLOGY, GEOCHEMISTRY AND GENESIS OF GOLD DEPOSITS: GEOLOGICAL SURVEY OF ZIMBABWE SPECIAL PUBLICATION 1, P. 645-660.

  • Production

    E/MJ 1978; WAR MINERALS REPORT 1976-1977

  • Reserve-Resource

    MINING MAGAZINE, 1987

General comments

Subject category Comment text
Deposit BRITISH SOLDIERS LOOTED (OPERATING MINE) ASHANTI CORP MINES INCLUDE: COTE D'OR JUSTICES, AYEINM, OLD CHIEF, TOMCOLLINS, ASHATI AND KOKORTASNIA

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1980 Gassaway, Judith S. U.S. Geological Survey
Updater 01-MAR-1988 Orris, Greta J. U.S. Geological Survey