SCHUYLER – His eyes are tired from scanning the conveyor belt. His feet and back are sore after hours of standing in his steel-toed boots. His brain is fried from searching for faulty welding and chipped paint on the more than 1,000 metal pieces that whiz past him on the belt during the graveyard shift.

NASARAWA, Nigeria (AP) — Dressed in a faded pink dress, 6-year-old Juliet Samaniya squats under scorching skies to chip at a jagged white rock with a stone tool. Dust coats her tiny hands and her hair as she works hour after hour for less than a dollar a day. The landscape around her is dotted with active and abandoned mineshafts, farmland that may soon be cleared in search of more rich ore, and other mine workers — many of them children.