HELEN REID and TANISHA HEIBERG ANGLO American's South African division is being sued over allegations of negligence at a lead mine it part-owned in Zambia nearly 50 years ago, according to a class action filed in South Africa's High Court. South African law firm Mbuyisa Moleele and UK-based Leigh Day said they filed the suit "on behalf of a class estimated to comprise more than 100,000 individuals" thought to have been poisoned by lead from the mine in Zambia's Kabwe district. "The application is brought by 13 representative plaintiffs on behalf of children under 18, and girls and women who…