These remains are what's left of the processing area for the nearby mines producing Micaceous Haemetite.
I helped regain this location in 1990 from trees and overgrowth when I was an apprentice to DNP. This is the processing area for the nearby mines. The circular areas are buddles, allowing separation of the load from the lighter ore once crushed, using water and brushes. The ore was then spread to dry on a wooden floor which was heated underneath by air from the chimney before being bagged up and loaded into horse drawn carts below. The footpaths converge on this area as they were forged by the workers - and women would often be employed at this location whilst the men worked underground.
There is a collapsed adit a walk uphill along the track, and 1 or 2 other accesses in Wray Cleave woods.
If you are interested in how this worked, visit the nearby Kelly Mine who have a restored and working mine similar to this a short way down the valley.
Note: I have not put a parking waypoint for this cache. There is a pull-in on the steep road close to the cache, but that road really is not suitable for two wheel drive cars. The pull-in is small and soft - beware if you use it, the CO himself once got his car stuck there and needed to be pulled out! There is parking close to the footbridge at the bottom of the road, and at the top of the road.
Permission kindly granted by Dartmoor National Park using their Geocaching Guidelines