Probably a mine in the conflict zone, those areas have been banned from gold selling, they are either under some rebel controls or militias or even some corrupt army officers.
Bloody diamonds and bloody gold, a sad story that is one of the hallmarks of some African countries. Although I posted a link showing that many people are privately searching for gold, they are probably selling it to local powerful people below cost, and they are then looking for ways to sell it illegally.
I can only say that I am sorry that one continent so rich in valuable raw materials, including gold and diamonds, still does not allow its people to live lives worthy of man.