As a layperson I'm trying understand how this forms in the ocean...

As a layperson I'm trying understand how this forms in the ocean i.e. underwater. If I understand correctly an undersea volcano erupts and spews out a plume of molten mineralised rock. This plume spreads out at the temperature-controlled level, starts to cool and then settles on the sea floor, along the lowest point e.g. along a valley. How far Rupice stretches is the question? Perhaps the valley stretched from east of JB towards the northwest then turns north where you can see the yellow/green anomaly in Figure 1 of 7 March announcement. Another question is why are there multiple (at least 2) lenses? Perhaps related is the question of variability in grade?
Perhaps the volcano was active more than once and lays down another lens and/or remineralises the existing orebody.
It will take someone with more skill than me to explain how this all happened. IP & drilling will eventually tell us but if you think Rupice could stretch for a couple of kilometres (the company thinks this is possible) then you get the sort of PT you are looking for and you conclude this is still worth buying.
But remember that management themselves are not sure how Rupice formed and are calling it "unique".