I'm sure there are others here who can shed even more light on the actual ' Geology ' , however I believe the ' Key Word ' in not only your post but also the actual announcement is that as in virtually ALL successful Lithium showings are the evidence of ' OUTCROPPING ' .
Because by their intrusive nature , lithium pegmatites which have been formed hundreds of millions of years ago , are normally hosted alongside or near a granite fault zones where the intruded magma is pushed up to the surface and concentrates the minerals like Cesium and Tantalum , rubidium etc.... as the magma cools.
And so it would be more rare to just have remnants of pegmatites as in ' Boulder ' formations only on the surface , and hence why you have deeper plunging and often thick seams which follow the ' Outcropping '
So clearly we have a.) the proof of a large pegmatite field - vis a vis Azure which extends along these known faults , and which are evidence of a significant volcanic event pushing up and leaving behind these often similar direction igneous rock formations we call pegmatites ...., and which host Lithium crystals and other minerals. And.....b.) we now have the proof of the ' Outcropping ' trends which in turn prove this ancient Geology took place in this specific region.
Now all we have to do is drill into them and hit significant thickness at ( hopefully ) shallow elongated and contiguous depth.
