1 Introduction ................................................. 7
2 Geological setting ........................................... 8
2.1 The Archean ............................................. 8
2.2 The Birimian (Paleoproterozoic) ........................ 12
3 The geology of base-metal sulphide occurrences .............. 21
3.1 The Perkoa zinc deposit ................................ 21
3.1.1 Host rock ....................................... 21
3.1.2 Orebodies ....................................... 24
3.1.3 Structural geology .............................. 38
3.1.4 P-T-X conditions ................................ 41
3.1.5 Ore genesis and comparison to other deposits .... 45
3.2 The Gongondy copper deposit ............................ 47
3.3 The Dienemera copper occurrence ........................ 48
3.4 The Goren copper-molybdenum occurrence ................. 48
3.5 The Wayen copper occurrence ............................ 48
3.6 The Monogaga copper occurrence ......................... 48
3.7 The Zeitouo copper occurrence .......................... 49
3.8 Copper occurrences in the Faleme iron district ......... 49
3.9 The Tiebele zinc occurrence ............................ 50
3.10 The Gan lead occurrence ................................ 52
4 Sulphide ore potential ...................................... 52
4.1 Archean ................................................ 52
4.2 Birimian ............................................... 53
5 References .................................................. 56
Appendix 1: Base-metal sulphide ore in the Lower and Middle
Precambrian of West Africa ......................... 67
Appendix 2: Petrological characteristics of the country rock
of the Perkoa deposit .............................. 73
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