The Koné deposit is considered to be an orogenic lode gold-style system, hosted by brittle ductile shearing within a quartz diorite/mafic volcaniclastic package in a Birimian Greenstone sequence of the West Africa Craton.
Koné is a mesothermal, structurally controlled gold deposit hosted within a north-south trending, westerly dipping (50?), composite package of sheeted 20-30m thick diorite intrusions which have been emplaced by multiple intrusive pulses. These diorite intrusions are of the same composition and genetically associated but display a variety of textures. The package as a whole is up to 350m in true thickness and can currently be traced along strike for 2.4km
The Koné Gold deposit is hosted by the composite diorite body and is characterised by very large mineralised true widths, averaging >200m over the southern half of the deposit, with a maximum of up to 330m (MDD015B, 330.7m grading 0.58g/t) i.e. almost the entire width of the composite diorite body.
Higher grades (1-1.5 g/t) are associated with high density “swarms” of 2-5mm thick, foliation parallel, translucent white to smoky quartz veinlets containing fine grained sulphide. Lower grades are related to dissminated fine grained pyrite. Importantly, no significant silicification of the host rocks is associated with the mineralisation resulting in positive comminution characteristics.
Mineralisation at Koné is interpreted to be controlled by a major thrust shear at t ........
