We have no mine. There is no metal in the cave. We've already prospected the entire thing, and were quite disappointed that it turned out that no, there wasn't a mine. There are no valuable resources on our island beyond things that you probably already have.
If you're insistent on making sure there is no metal, Have you considered rather than telling us to get the hell out or die, just going the hell in and looking for yourself? We're more than happy to let you go in and look if you're willing to just ask like regular folk do.
I heard the entire story from the other folk who live here. You have your guys come up, claim you're part of Ironcliff and that you're scouting for metal, Then when one of our guys walks up with a bow you start screaming about how you're not actually with Ironcliff and that you don't want hostility... Then you dump a runestone saying you're watching, and we have seven days, on my docks? Enough. Have you tried diplomacy? Believe it or not, it actually works.
So I guess the short version of this entire thing for folks who want tl;dr:
No mine. No metal. Don't waste your time.