First and Second Congo Wars, a large part of which is battling for control of the mines in that region. It's one of the conflicts which gave rise to the concept of blood diamonds, which is to say, it's one of the few conflicts that's actually about control of natural resources.

(I'm assuming, of course, that the GP is largely talking about "wars I disagree with" when referring to "actively and openly stealing other countries' resources," because the number of recent conflicts that are openly about resource control is very small and the US is involved with none of them. The Iraq War is often claimed to be about oil grab, but that doesn't really make any sense when you dig into the history of the buildup to the war, and in any case, it certainly wasn't "openly" about it.)