These ore bodies formed in different places along a ring fault in the caldera. About 50million years after they were deposited, the tectonic plate of which they were a part collided with another small plate and then with the proto-North American continent. The collisions, which welded the plates to the continent, folded the Cleopatra tuff in such a way that the two ore bodies ended up on opposite sides of a fold called the Jerome anticline.
These ore bodies formed in different places along a ring fault in the caldera About 50million years after they were deposited the tectonic plate of which they were a part collided with another small plate and then with the proto-North American continent The collisions which welded the plates to the continent folded the Cleopatra tuff in such a way that the two ore bodies ended up on opposite sides of a fold called the Jerome anticline