Grid above my quarry?

[JuicyX]

Even if I press F9 it doesn't go away. What do I do?

[Maxis010]

Looks like a force loaded chunk indicator

[Meems33]

Does it go away with f6?

Go into Options > Controls and see what keys are mapped to the two chunk loading options.

If those don't work, then try deleting options.txt in .technic/tekkitlite and restarting the technic launder.

[00Ducky]

I get that with F6.