When you climb up the ledges above the pool, be careful whilst jumping to this ledge. Lara will most probably slip and grab the edge if you don't move her as soon as you land.

Once you reach the main room in the mines, ignore all the rats completely. If they bite you, they will only take a little of your health, and if you occupy yourself with them you will only lose time.

When you have to move this box, move it towards the entrance just a little. You can jump on top of the cabin containing the Pistols easily from there.

Once on the walkways in the main room of the mines, you don't have to push this box down if you don't want to. You can just jump onto it, and from there, onto the opposite walkway.

Still on the walkways. When you reach this point, from the line marked on the screenshot to the left, jump onto the slope ahead of you. When you land, immediately jump to the opposite walkway, so that Lara doesn't slide down to the floor.

Having picked up the Green Fuse, be careful on the wall-run, as Lara gets kind of wacky on the opposite side. You should be able to jump onto the ledge to the left side with no problem, however.

You can take a shortcut here as well. When you grab the ledge, turn around and jump down into a pit. Lara will land on a structure on the wall and she will lose a little bit of her health. Then, press and hold Crouch. That will make her slip and grab the ledge. Release to grab the ledge below and then drop down to the floor.

Once on this ledge, be sure not to jump from it too early, or you will fall to the ground. It would be best if you jump when Lara is positioned as in the screenshot to the left.

When you reach the control room again, use the Blue Fuse only and then push the button to gain access to your Pistols.

In order to emerge into the lava room without delay, make sure to dismount the moving car before it smashes into the wooden boards.

Before the second interactive cut scene in the level, jump to the slope directly from here and then to the ledge in front of the pyramid.

The screenshots to the left show the best route to complete this part, before the end of the level.