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I don't know if the exploitation will be fast enough to make a huge difference, at least for the time being. It being so difficult to get to it gives other leading countries, namely China, to re-think their exploitation and sale of these materials. They could find a way to stabilize the supply side market with this extra time. Especially since so much of the manufacturing using these materials is done in their country. Still though, I agree this new supply should change buying and manufacturing behavior.

Which may enable new technologies that weren't cost effective before.

Or some other technologies will replace the materials used, rendering the new deposits useless, from a cost-based perspective.

Is the find actually cheaper to extract than current resources, though? This may act more as a thing to ramp up if supply shocks drive up prices.