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If you haven't checked the Trials of Ascension site in the last few days you should swing by and check out the devs' recent post on Mining. Sounds like it's going to be pretty cool, with the possibility to dig just about anywhere for resources. Skilled miners will be able to go deeper and find better materials, but as always with this game, there are risks! Collapses, gas fires, and unleashing monsters from below to name a few.
I don't think this is going to involve any actual terraforming so I'll be interested to see exactly how they implement the mining gameplay.