Janet Gunter, co-founder of The Restart Project estimates that 1,000 Titanics’ worth of discarded electronics is dumped in the UK, with much of it extremely toxic if mishandled. In 2017, the United Nations University’s Global E-waste Monitor predicted global e-waste would hit 50 million tonnes this year — three million tonnes of it being small objects such as mobile phones. These discarded objects are also a rich source of metals, with an average smartphone containing 24mg of gold worth around $30.

For smarter e-waste urban mining, read on.