Uhm, I don't remember! I remember the minefield. I never quite solved HOW to get through it safely, I just jumped like a madman in the direction of the corpse that's lying in the middle of it. I figured, he must have gotten that far and died from blast, basically clearing a path for me.
Oh, and forget about the coded door for now.
The Jupiter plant.. hmm.. I know one of the helicopters was only reachable through a guide. You need to jump through an anomaly somewhere.. But I am not sure if that was the Jupiter one.