Itumbula - a bit of speculation19 Feb 2022 18:09
continued....
And it just so happens that this location also appears to contain a fault structure, similar to that at Tai-1.
I must note here that my geological knowledge is very amateur, and this is speculation, but I've annotated a GE image with my conclusions, for those that are interested, here -
https://www.flickr.com/photos/194934344@N06/51890972159/in/dateposted-public/
The yellow lines represent faults, the one to the NE being a clear escarpment, and the red areas small lakes and salt evaporation ponds - again similar features (albeit on a smaller scale) appear at Tai-1.
The fault boundary marks a clear change in land use between SW and NE, the NE area being higher as a result of the scarp feature, and the SW area used for salt production as are the IHS.
The salt appears to bubble up from below as brine, filling the evaporation ponds from below.
This is a recent paper on the IHS mentioning that the springs are both hot and cold, and appear to be fed from Lake Rukwa. Before anyone gets excited it doesn't mention Helium.
https://www.ajol.info/index.php/tjs/article/view/207037
The point I'm getting at is that the helium (10%) appears to bubble up at IHS, with the brine - presumably from the hot springs which are heated by volcanic activity. Salt production is extensive in the SW part of the image above, and it is not a great leap to assume that He is bubbling up there also. Add in the fault, which could form a trap, and this is the reason for the second purple dot on the map on p 87 of the AD.
My (possibly slightly iffy and not fully formed) conclusions would be that area of the Tai faults and the Itumbula fault have always been areas of prime interest for He-1, over and above any other areas, and that Tai became a priority after the first seismic.
The area of Itumbula I have market is a likely location for drilling in the summer 2022.
I suspect He-1 have samples from both areas or He around 10%, and the geology is good at both of these.
I think He-1 will concentrated closely on these two areas to the exclusion of elsewhere until such time as they hit the jackpot.
All IMHO, DYOR etc