To get to the quarry you will need to cross the waterway connecting Muirhead reservoir with Camphill reservoir. You don't need to get your feet wet, a pathway will take you across. Please note, to get to this cache you will have to cross fences, so be mindful of this, it may pose a problem for those with dogs.
Having crossed the water connecting the two reservoirs, head into the disused quarry to find the puzzle. Please note there is a decoy piece just to make things a little trickier! Once completed, this will reveal the final co-ords for the cache. Be mindful of sheep and respect the area. Enjoy!