There are plenty of very large calderas that are unpopular and already host to mining operations. Much of the west coast is stuff like this. McDermitt Caldera

There are plenty of very large calderas that are unpopular and already host to mining operations. Much of the west coast is stuff like this. McDermitt Caldera contains over 3 million tons of lithium, for instance: https://en.wikipedia.org/wiki/McDermitt_Caldera https://en.wikipedia.org/wiki/McDermitt_Caldera