Within the Camp, near the brow of the hill are ‘Fairy Sleets’, these, as the Rev. HH Winwood explained, are ‘slits’, narrow and shallow trenches formed when ore has been found by cutting through the rock to follow it out.
I found this in the 1904-08 volume of the Somersetshire Arch Soc Proc (Bath Branch). Perhaps someone knows more about to what it refers?