Mauritania's economy is sharply divided between a traditional agricultural sector and a modern mining industry that was developed in the 1960s. Mauritania has extensive deposits of iron ore, which account for nearly 40% of total exports. Natural resources of Mauritania include petroleum, gold, fish, salt, iron ore, phosphates, gypsum and gum Arabic. The chief exports, in addition to iron ore, are fish and fish products, gold, and cattle. Mauritania's leading imports are machinery and equipment, petroleum products, capital and consumer goods, and food. The principal trade partners are France, Belgium, Japan, and Spain.