RE: D'Kar/Ngwako Pan contact20 Dec 2022 22:58
@FKC. Somewhat ambiguous tweet. All Cu/Ag mineralisation in the KCB is found at the DK/NP contact, but not all this contact is mineralised. In fact, very little of the contact is mineralised - otherwise there would be a sheet of mineralisation across the entire KCB. This contact is a redox boundary, meaning that the marked change in chemical conditions is conducive to the deposition of minerals from rising hydrothermal fluids. However, there must be some kind of conduit for those fluids beneath the DK/NP contact, and it is this 3-dimensional situation that is being searched for.
In practice, deposition is most common in the (often sheared) limbs of anticlines, and in fault or other shear zones, since these enable relatively free upwards flow of mineralised fluids. CSAMT appears to be pretty good at identifying those sheared zones / conduits, and where they intersect the DK/NP gives the greatest chance of finding economic mineralisation.
I would have hoped that all six drill holes would be planned to hit such an intersection, but have not seen CSAMT data combined with the previous geochem & geophysics for each of the holes - if not, why did they position the drills where they have? It is not very clear if the first five have been completed in DD, and if they have, there has been no announcement of hitting anything interesting. I guess it will come out in the wash at the end of the campaign. Hope that helps - K