The world of minecraft has ten times the surface area of the earth. I really don't think we'll run out of resources to exploit. Not that exploring that far on a server is a great idea >_>...
Oh yeah; I remember reading a topic about that once on B8! That a Minecraft world is somewhere on par with Uranus or Neptune; somehting like that.
For clarity: Ytterbium_70 will be known as Darkwellor in this server.