Serbs and Kosovans dig deep for remains of Trepca's mine The Trepca mining complex in Kosovo - once the flagship of the Yugoslav economy employing 17,000 people - has seen much better days. But its subsoil rich in zinc and lead makes it a rare economic asset of Kosovo, and as such it is hotly disputed by Serbia and its former province which proclaimed independence in 2008. IMAGES AND SOUNDBITES