The geological structure of the Catoca Mine is complex and the mineralized body is subdivided into three different parts. The Central, up to 200m deep, is composed of volcanogenic-sedimentary rocks (kimberlito tufistic).
The part that surrounds the walls of the chimney has the ring shape and is composed of kimberlites and rocks derived from them and represents the main industrial ore (kimberlito porfírico). The central part of the mineralized body, below 260m, is composed of autolytic kimberlytic breccias. Up to the depth of 100m the average diamond content is distributed unevenly, the western part being richer than the eastern one.
The nesting rocks consist of gneiss. At depths of 65 to 75m the rocks are represented by several species and solid monolithic material. The physical and mechanical properties of kimberlite, at the higher levels, reveal its low resistance, easy grinding and high self-disintegration.
Geological Prospecting and Geophysical Research
The geological activities at the Kimeberlito Catoca level include, follow the following steps:
1. Analysis and processing of geological and geophysical information;
2. Geological, geophysical and mineralogical mapping;
3. Data collection with electromagnetic methods;
4. Magnetic survey;
5. Aerogeophysical survey;
6. Directional drilling;
7. Helical drilling;
8. Drilling of detonation wells;
9. Drilling of hydrogeological wells;
10. Well profiling;
11. Treatment of geological samples / tarolo and large volume;
12. Mineralogical and petrographic analysis;
13. Geomechanical studies.
Catoca conducts research on:
- Concessions of Catoca, Luaxe and Vulege (Lunda Sul)
- Concessions of Luemba, Luangue and Tchafua (LundaNorte)
- Concessions of Gango and Quitúbia (Kwanza-Sul)