After you die, you can still move, can't restart. Found the rover, it's where the terrain slopes down. I could not find the mineral location though. When I'm in the rover, the inertia of the rover does not transfer to the player so I find myself sliding back or forward if moving in the opposite direction. Also, the rover seems to be pushable by player momentum while inside it. So if you walk to the right or the left the rover will turn in those directions.
The game reminds me of scanner sombre! I definitely felt that sense of crap where is the rover and wandered around and died before I found it the second time. The restricted vision and ticking oxygen.