Numbi, a little village hidden deep in the Democratic Republic of Congo mountains, lies nonetheless at the heart of our world. Here, with their bare hands, miners dig the coltan which will find its way – legally or otherwise – to our industrialized world. For decades this grey gold, indispensable to the manufacture of almost all contemporary technological devices, has been the cause of conflicts and a bitter exploitation. In Numbi, bodies are covered in mud, hands red with blood, and coltan hides in every pocket.