Torren IV is home to the Fixer, a bunch of junk, and a robot graveyard (it's pretty morbid, now thinking about it), but it is also home to two gold bolts. Here's how to find them in Ratchet & Clank: Rift Apart.
Gold bolt 1 in Ratchet & Clank: Rift Apart
Follow the path from your ship, take out the enemies in front of you. Next, on your left, slingshot your way over to a wall running platforming section and reach the main street. Once you’ve reached the end of the market, go to the rocky section in front of you on the left. Reach the top of the rockface and keep following the path until you find a grind rail on the right.
Jump on it and begin to ride it down. The first obstacle comes during a downslope part of the grind rail. Jump right to avoid the train. You'll go through a small metal tunnel and then find a giant ball of scrap. Go left to escape a one way ticket to pain town. Next, you'll see a section of the rail that is missing above you. Hop over the gap. Go right, left, and then right again sequentially as the trains rush towards you. Keep riding as you bother a few crows. Jump right to narrowly escape a cheeky train and go left straight away, so Rivet doesn't fall into the abyss.
Next, you'll see an orange barrier. Jump to the left of it. Instantly, you’ll see a warp point. Press L1 to shift to it. You’re now on the rail that leads you to the gold bolt.
Gold bolt 2 in Ratchet & Clank: Rift Apart
This gold bolt requires the upmost speed to reach it. From your ship, go down the path and instead of using the slingshot on the left, go right. Use your hoverboots to propel yourself up with the boost pad. Keep going forward and get ready for a wall running section. Once you're done with that, finally use the green slingshot to make it to your gold bolt.