It would be possible...however there are a couple of things that complicate matters.
Node spawns are not completely static. Just because a Barrow Iron node spawns in one location one time, doesn't mean that the next time it will be in that exact same spot.
Second, ore tends to share spawns - so that particular spot might contain barrow iron, or it could be gold or it could be nothing.
So best case scenario is that a particular spawn point will show you where someone got one of two types of ore at one time.
It can be mapped, and I do have plans on including such data, but it's probably only going to be useful to get an idea of which areas contain what tier, and possibly for scholar mats, as those are in short supply until you get to Moria.