Bulgaria has significant reserves of metal ores, especially copper, zinc and lead, situated mainly in the southern half of the country. The two largest iron ore mines are located in Kremikovtsi near Sofia and Krumovo, Yambol Province with total reserves of 430 million tons. Manganese ore is extracted near Obrochishte in Dobrich Province (reserves of 85 million tons), as well as in the provinces of Sofia and Varna. The reserves of chromium are small and are scattered in the Rhodope Mountains. Bulgaria possesses important reserves of lead and zinc, of them 60% are situated in the southern reaches of the Rhodope Mountains along the border with Greece at Madan, Zlatograd, Madzharovo, Rudozem, Laki, etc. Other mines are located near Ustrem and Gyueshevo. The reserves of copper ore are also significant, situated mainly at Asarel Medet near Panagyurishte, Elatsite mine near Etropole (650 million tons), Elshitsa, Medni Rid near Burgas, etc. There is gold near Tran, Chelopech and Madzharovo, as well as small quantities of platinum, silver, molybdenum, nickel and tungsten.