RE:RE:RE:RE:Turn around AK6 kimberlite is an extinct volcano. The cone is thought to have been as much as 100m above the ground level at the time it erupted. That was 90 million years ago.
Since then the cone has been weathered to ground level along with any diamonds it contained (eluvials). However the ground level that we see today is above the original ground level due to the Kalahari desert advancing from the west and covering the entire region with a thick layer of sand. At Karowe the sand layer is anything up to about 30m deep.
So the diamonds that were already weathered out before we got there are either on their way in rivers and hence to the sea (alluvials) or they are stuck in depressions/cracks/holes/paleo-river beds and the like at varying distances round about the source.There are no present-day rivers.
DeBeers have located eluvials in the vicinity of their own Orapa Mine and Tsodilo Resources are looking for Karowe eluvials to the west and north of Karowe Mine fence. Lucara has a shareholding in Tsodilo.
If I were Lucara I'd be looking a bit closer to home ie within the fence.
For more information have a look here:-
https://tsodiloresources.com/s/Diamond-790752.asp.html