Just thought I would chime in. Yokes you have a royal trail marker with an "X" or inbound symbol. "X's" are always in bound to a campsite, to a shrine, to a mine or treasure. Usually an "X" would mean go left and look for another "X" but I've seen them used for pointing out a trail in the distance as an inbound. I would look where the pointer rock is pointing when viewing the "X" from the left side of the pile. Although symbols by themselves usually mean nothing, you have a combination of a heart, an "X", a pointer and an open triangle or sun pointer. All of which point out a very old existing trail.
Are any of the mines nearby for Gold? They mined other metals as well and symbols for those were not as important as the Gold was.
It's obvious the pile as stacked by man and not nature. These markers were meant to be seen from a long distance and approached for reading up close. So the symbol "X" is important.
Thanks.