A Sky News investigation has found children as young as four working in Congolese mines where cobalt is extracted for smartphones.
The mineral is an essential component of batteries for smartphones and laptops, making billions for multinationals such as Apple and Samsung, yet many of those working to extract it are earning as little as 8p a day in desperately dangerous conditions.
With little regulation requiring companies to trace their cobalt supply lines, and most of the world’s cobalt coming from the Democratic Republic of Congo, the chances are your smartphone contains a battery with cobalt mined by children in the central African nation.