A court in the Democratic Republic of Congo has temporarily removed control of a huge copper and cobalt mine from its Chinese owners. The BBC reports that the ruling in favour of the Congolese state mining firm, Gecamines, is part of a dispute in which the government says it is owed billions of dollars. It accuses the Chinese firm of understating its reserves. The mine is one of the world’s largest sources of cobalt, which is a vital component in batteries for electric cars.