Steve Donohue:
The northern part of Wisconsin — the pre-Cambrian bedrock, which is about a billion plus years old — is an old volcanic belt, OK? It's referred to as the Penokean Volcanic Belt. In these volcanic systems about a billion years ago, you had materials being expressed at the surface of the ocean floor, if you will. And that material was rich in various types of metals, like copper and zinc and precious metals and other things that we're finding now such as tellurium, which is needed for solar panels. That stuff all settled out on the ocean floor, OK? And then over time, more sediments built up on top of it, it turned into rock. Some of this stuff was uplifted, and that's what we're drilling, is those types of systems where they have concentrated mineralization of things like copper, zinc, precious metals and other rare earth-type elements that are really important for our economy today.