Hydroneer

From indie developer Foulball Hangover comes a brand new casual sandbox game with Hydroneer. 

Hydroneer is a game where your only objective is to dig for gold and other resources. As you do so, you need to construct mining equipment and a base of operations to keep your profits going. Start with primitive tools but slowly build up to powerful, hydro-powered machines, and create massive structures as your mining operation grows and becomes more prosperous.

Using a voxel-based terrain system, you can do more than just mining for gold of course. Create massive caverns and quarry pits, discover long-lost relics, and use your hydro-powered machinery to craft the resources you need to keep expanding. 

Hydroneer is available for the PC.