Ok, I'll take a shot at it. Here's what to do if you're having trouble navigating through the mines and dealing with the mine monsters.
*Before you go in, arm yourself with the stun baton. That's right, I said stun baton. It doesn't use up any ammo and can kill a mine monster in about two or three hits.
*If the tunnels are too dark to see, try using your night vision goggles to see or just turn up the game's brightness.
*Finally, when paths branch out, always take the path on the right. You'll get there eventually.
I hope that helps, though being a little more specific would have been great.