RE: BT1 Feb 2022 10:14
Ella - The current KSZDD002 drill stopped in December at -350m, in Karoo sediments - these are a mix of sandstones, shales and clays, and the rapidly changing and unpredictable nature of these sediments was what was causing the drilling problems - including the clay layers unfriendly habit of expanding sideways and blocking the drill hole.
Based on the profile of the borehole KSZDD001 about 1km away, KAV were expecting to find within these sediments either two coal seams (I think this is most likely) or possibly two layers of volcanics, at depths of about -400 & -450m. Your eyes are not playing tricks, it is difficult to make out on the diagram what these layers are supposed to be. There was then a further layer of sediments, then a 70m thick section of intrusive Karoo gabbro - this is younger, molten magma that has pushed into the existing Karoo sediment series. That is in turn underlain by what appears to be a thick coal seam, then a thick rock formation that has not been identified publicly - this is shown in pink on the chart you refer to. I assume this is just more older sedimentary layers that they forgot to label - no need for any conspiracy theory as to why it wasn't labelled :-)
The B1 conductor appears to be at the same depth in KSZDD002 as the intrusive Karoo gabbro found in KSZDD001, which is one reason they are expecting it to be a sulphide rich ore body deposited as part of the Karoo gabbro intrusive process. The trouble is, expectations and reality do not necessarily match, it is quite possible for the lateral stratigraphy to change unexpectedly over a distance of 1km. I still expect the perceived delay in making an announcement is due to slow drilling in soft sediment, with a possible need for interim casing, and/or a desire to do multiple DHEM. We will find out soon enough.