Structural characterization of former mining works in the North west Formations of Lake Kivu (case of Bishasha, DR Congo)

The formations of western Lake Kivu are typical of Mesoproterozoic that is dominated essentially by metasedimentary rocks with a minor part of metavolcanic rocks cutting by massive granit. The sector of Bishasha is constituted by quartzite, shale that aren’t spoilt in which once we exploited wolframite ore. That mineralisation is often presented like stockwerks.The regional tectonics which affected Bishasha sector led to brittle microstructures which attest to the extensive phase experienced by this terrain, confirmed even in the study of stress by WINTENSOR. The preferential direction of cleavage NNE-SSW would justify the existence of regional folding and even coincides with the orientation of the main stress NNE-SSW which corresponds to the first phase of deformation that affected the kibarian chain