If you haven't been there - and seen the landscape - then your opinions are entirely speculation. As the piece of carved stone is portable I'm going to suggest to the farmer that he moves it to his front garden, where it is more safe from pilfering. There are many stones all about his railway field, and they need collating, somehow. There is a superimposition of features and a catalogue of recording errors.

Let me know when you've found (at least) the entrance to the Bold Venture Mine ( http://www.themodernantiquarian.com/site/8262 ). If you or Fitz have sufficient bandwidth I've an 8Mb image that needs 'colouring in'.