Does ore rock respawn?

[Feyd]

I am assuming ore rock re spawns. If so, what is the timing?

[Pesky]

No. You collect rock from the surface and it doesn't respawn. It's a very easy source but once it's gone it's gone.

The game relies on you mining when you want lots of metal. There's a great deal of metal ore underground. You just have to find it, which is sometimes not easy, and other times requires you to dig a long way below the surface. In late-game you can build a metal detector that tells you which direction to dig in.

[Feyd]

What about Arctic ans Savina? They eventually empty?

[Kaeru Gaman]

as Pesky said, the high amounts of ore are underground.
enter the wormhole caves and spelunk your way.
you'll find lots of ore just on the cave walls without a need of aimlessly digging.

[Folger419]

You have to go to the arctic and savannah for aluminum and gold. while your there get as much as you possibly can unless your going to go back allot.

[red51]

None of the resources in the game respawn automatically (except animals, if you consider them a "resource") ^^ But the world basically consists of an infinite amount of islands, so it's impossible to run out of certain resources at some point... but even a single island typically provides more than enough resources (as mentioned by others, most ores are underground) :)