As talked about in some reports there is a desire to focus money back in North America in exploration because of the issues arising from dealing with third world countries. Bloomberg cites this new political change in approach is one of negating contracts, and simply having government 'renegotiate' different terms. Holding up permits, 'revising mining codes' and other strategies apparently allow these jurisdictions to stop previous agreed upon terms in favor of a better deal. Of course, this can happen but it sends a loud and clear message. You can explore here but if you find something we will renegotiate.