Simon Panay’s film takes us into the world of Opio, a boy of 13 who works at a gold mine in Burkina Faso. As you might imagine, it’s a harsh existence, with an oppressively narrow range of options. Even the most basic education costs money, and Opio’s family has precious little of that. The boy decides on a training program for welders, but to earn enough for tuition, he must take his current occupation one step further, moving from peripheral tasks to the dangerous work of going down into the pits.