The position of the rock 1meter before lifting it up
The White Stone is a true code marker. I have seen and also recovered such a white stone and found goodies behind it. I have also found such a white stone on the surface and it was code marked for direction and distance. Confirmed real site.
In this case the direction might be off the sharp point of the stone, or 90 degrees off the point. The iron bars are markers and may also be unites of measure or directional pointers. Remember::
1cm in length = 1 meter in length real
true direction can also be using a watch, at 10am off from the pointing direction of the marker.
often code markers left behind have no code book meaning and are only what the persons whom put it there to mean and was recorded on a map. They always made a map in hard copy.
You have a real site, hope you can find it.
The letter " B " may also mean 2 deposits. The B could be a Sombrero , count the humps.
Z