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Sampling practice at Prestea Goldfields Ltd of Ghana

Conference Paper


Abstract


  • The Prestea Goldfields Ltd of Ghanas, West Africa has produced over 170 t of gold with average grade of 11 g/L since 1912. The deposits occur in a wide shear zone which closely follow the Birimian-Tarkwaian contact. Both the Birimian and Tarkwaian systems are of Precambrian age. Underground exploration is carried out to delineate ore bodies by means of AX size diamond drilling at 50 m sampling intervals. After the orebody has been delineated, development work is carried out by exposing the gold reef. Channel sampling is then carried out at about 3 m intervals in both the stope and stope drives. A channel sample length is commonly 0.6 m, but may vary depending on physical characteristics of the reef. The values of channel samples are linearly combined to obtain the average reef or stope values and/or widths of the exposed sections. The sampling practice and methods of improving the efficacy of sampling at the mine are described.

Publication Date


  • 1992

Citation


  • Adadey, E. K., Baafi, E. Y., & Appiah, H. K. (1992). Sampling practice at Prestea Goldfields Ltd of Ghana. In Conference Series - Australasian Institute of Mining & Metallurgy (pp. 39-43).

Scopus Eid


  • 2-s2.0-0026947188

Start Page


  • 39

End Page


  • 43

Abstract


  • The Prestea Goldfields Ltd of Ghanas, West Africa has produced over 170 t of gold with average grade of 11 g/L since 1912. The deposits occur in a wide shear zone which closely follow the Birimian-Tarkwaian contact. Both the Birimian and Tarkwaian systems are of Precambrian age. Underground exploration is carried out to delineate ore bodies by means of AX size diamond drilling at 50 m sampling intervals. After the orebody has been delineated, development work is carried out by exposing the gold reef. Channel sampling is then carried out at about 3 m intervals in both the stope and stope drives. A channel sample length is commonly 0.6 m, but may vary depending on physical characteristics of the reef. The values of channel samples are linearly combined to obtain the average reef or stope values and/or widths of the exposed sections. The sampling practice and methods of improving the efficacy of sampling at the mine are described.

Publication Date


  • 1992

Citation


  • Adadey, E. K., Baafi, E. Y., & Appiah, H. K. (1992). Sampling practice at Prestea Goldfields Ltd of Ghana. In Conference Series - Australasian Institute of Mining & Metallurgy (pp. 39-43).

Scopus Eid


  • 2-s2.0-0026947188

Start Page


  • 39

End Page


  • 43