I am looking for the last sphere or lever (of 8) which will allow me access..

I'm assuming you are referring to the flit switch locations in the Auroran Mine.

The flit switch locations:

• When you first enter the mine, go up the first flight of stairs onto the raised platform. If you look left, you will see a ranged flit switch.
• Go down the stairs on the other side of the platform and follow the walkway. Cross the landing near the large statue to where a gap separates the landing from a central platform. Face back towards the entrance and you will see a flit switch.
• Go down the steps on the other side of the landing. The flit switch is stuck in the pillar to the left of the steps.
• Follow the corridor down beside the statue, and the next flit switch can be seen underneath the central platform in front of the statue.
• Go along the lower level, and follow the corridor back up. The flit switch can be found in the corner of the next level at the bottom of a ramp.
• Go up the ramp and turn left onto the landing at the top. In the middle of this landing is a small roofed structure held up by four pillars. The flit switch can be found stuck into the underside of the ceiling.
• Cross the landing and find a wooden path that connects to the next platform. The next flit switch is in the pillar on the left as you reach the end of the walkway.
• Cross the platform and pass under the scaffolding on the left to reach a lower level landing. Follow it around to the right and you will see the final flit switch in it's holder on the side of the pillar ahead.