Ah that would make sense that they need to be mined. Still, that is a cool hobby I have never heard of before! You should make a post explaining the full process. Perhaps I will make a post explaining back country skiing as well for those who have never heard of it.
(edit: subscribed! You got me interested)
Also things are a bit harder if you have a niche hobby. I started a community for back country skiing and I am still hoping that we get more content posters.