Recently, the government of DR Congo announced results of an audit of mining contracts signed with the former military regime, mostly by foreign companies. Arguably, it took the return of a fragile democracy (though certainly not of stability) for this process to be fulfilled.
Now, the junta which seized power in Guinea earlier this year is embarking on a similar exercise. And the fortunes of both AngloGold Ashanti and Rio Tinto are at stake.
See http://www.minesandcommunities.org/article.php?a=9475.