More than 2,400 mines - many illegal and unregulated - are releasing deadly chemicals such as cyanide and mercury into rivers across much of mainland Southeast Asia

Metals like cobalt, nickel and platinum, which are in short supply on Earth, can be found in M-type asteroids

Australia’s national broadcaster reported this week that Perth Mint had sold an approximate 100 tonnes of diluted gold bars to China between 2018 and 2021