The Supreme Court has upheld Virginia’s ban on uranium mining. In a 6-3 decision Monday, the justices ruled that the federal Atomic Energy Act does not override Virginia’s uranium mining ban, which was enacted by the Virginia General Assembly in 1982. Chatham-based Virginia Uranium Inc. filed suit in 2015, arguing that the state lacks the authority to enforce a ban on mining and milling the radioactive ore. The company owns the Coles Hill property in Pittsylvania County, which is believed to hold the largest deposit of uranium in the country.