Watch VoirFilms. Thirteen-year-old Opio works on the grounds of the Perkoa Gold Mine in Burkina Faso. His only pay each month is a bag of rocks, which Opio hopes may contain traces of gold. His father wants him to go to school, but must raise the money himself and goes underground. Shot with stunning cinematic flair, Simon Panay’s exceptional documentary is a tale of dogged determination in the face of danger.