They could have started in the bubble, until those fields were depleted which would organically entice the miners further afield in search of riches and they might engage explorers to find, and keep quiet about all the rich rings, lest they deplete quicker due to competition. I envisage demands for OPEN only mining...See, that's what FD really should've done... like how we have different organic/geological "exploration" stuff, the mining things which generate the best cash should be out in the void, not in the bubble.