Good afternoon Ladies and gentlemen:
By a curious coincidence that appears to be of the exact size and shape of the monument as required by Mexican law to establish the location of a mining claim.
Look carefully for any remains of the required data which must be painted on the monument on one of the faces with black paint.
You especially need the EXP. data. The name is actually useless since there are so many duplicates
The cross on top is to be used to establish the precise location of the surveyors instrument, whether a GPS now, or a sextent then. A plumb is dropped from the physical center of the measuring device
Se the accompanying pictures for the details.
Some where in the vicinity there is a mineral showing, probably a mine. Ask around. Also, while not very effective, ask for the name. It is possible that you can find the files of the original agency and locate it among any others by the lat. & Long. or base reference point.
Don Jose de La Mancha