At the start, there is a golden square on the wall. Use heat (e.g. Ironman) to blow it up. Then use Single Rope Handle Pull (e.g. Ms. Marvel) on the Plug and then blow up the Silver Lego (e.g. Ironman)
Same area, at the back, there is a cart with charcoal. Fill the machine with Telekinesis (e.g. Doctor Strange)
In the area where the green strenght handles are in the story, there is a platform for Captain America. Use it.
Token: Superior Spider-Man
Smash everything in the crane area. Go through the vent using Vent Travel (e.g. small Groot)
Also here in the crane area, fly up. There is a place to use a Gravity Mine with Star-Lord. Then use Dig (e.g. Rocket) to get to the Minikit
In the story, you have to use the crane to move the blue box on the tracks. Also move the other blue box at the back. The Minikit is underneath.
Character in Peril (Stan Lee)
Here in the crane area, there is a lava stream to the right with a grey lid. There is also a panther. Fly over and smash the panther. There is a Rune Tracing pad underneath it. Use it (e.g. Doctor Strange). Then use Telekinesis to get him to safety.
In the whole mining area there are 5 carts filled will gold. Blow them up with Heat (e.g. Ironman)
In the last section of the mine, the one to the right, there is a Electricity Panel, where the carts go up and down. Use Electricity (e.g. Thor). The Minikit will be transported down, so get down to the crane area to pick it up.
To the right, smash the glass with Sonar (e.g. Black Bolt). Then use Fuse Box Access (e.g. Ms. Marvel) to get the Minikit.
Hop on the Jackhammer and move over to the Minikit trapped in stone / metal.
Continue with the story, to the boss battle. There is a teleportation pad to the left. Use it (e.g. Thor) to pick up the Minikit on the other side.