Requires the Jetpack: In the furthest south area of the map, use your Jetpack to access a Magneboots track. Walk along it and turn the crank bolt located at the end. Keep following the path to reach an elevator that will take you to the gold bolt.
In the south-west area, a gold bolt is heavily guarded and protected by a forcefield. Defeat all enemies and activate the three buttons to access it.
In the north-east area, a gold bolt is located at the center of a hollow platform. Defeat the enemies nearby and wait for the the small volcano to stop spitting lava to get it.
In the north-west area, a strip of land can also be accessed from above using the Jetpack. Land there to access a gold bolt sitting next to a few crates.