It may also be just the size of mining and that a couple years ago, it wasn't getting bid up as much, more than necessarily a 2x devaluation of USD over past two years.

I have a similar thing with macadamia oil I'm working on getting going where there is a small supply at a pretty low cost since it's a sort of waste product, but if I can make the oil trendy, that will shoot up in a few years.