The Ruined Shaft is the name of one of the mutie nests found in Rage 2. Nest is located in the central part of the Twisting Canyons location.
To get to The Ruined Shaft you need to jump into it. Your next task will be to move along the tunnels. If you encounter an enemy, shoot him at will.
Remember that your goal is to get rid of all the enemies in this location.
On this site you will find 6 storage containers and 1 Ark chest. Look carefully to collect all the items. These will help you expand your inventory.
Follow the constant path straight until you get to the huge gate. Behind them you will find another part of the shaft.
When you get to the end of the mine, turn right. There you will find another part of the location.
Having reached the hole in the ground, go down the ladder. Go ahead all the time.
At the end of the location you will find Lug The Nut. It's a big monster trying to kill you. Aim at his head and you will cause him huge damage. Defeat the enemy.