Are you sure your friends are using the correct terminology here?
I think cast iron is VERY easy to obtain. Wrought iron is different and no maker in the world currently produces wrought Iron on a commercial bases. That would explain why your friends are going after "very old fences" and stuff. They are cleaning up the old wrought iron fences. Wrought iron and cast iron are two very similar metals, but not the same thing whatsoever.
I may be wrong, but I think someone has got their metals mixed up.
I have no intention of traveling from birth to the grave in a manicured and well preserved body; but rather I will skid in sideways, totally beat up, completely worn out, utterly exhausted and jump off my tractor and loudly yell, "Wow, this is what it took to feed a nation!"