Iran's economy is a mixture of central planning, state ownership of oil and other large enterprises, village agriculture, and small-scale private trading and service ventures. Iran's economy relies heavily on oil export revenues. Oil exports account for nearly 80 percent of foreign exchange earnings. Iran is rich not only in oil and gas, but in mineral deposits, as well. Iran has the world's largest zinc reserves and second-largest reserves of copper. It also has important reserves of iron, uranium, lead, chromite, manganese, coal and gold. To date, the mining industry remains underdeveloped. Iran is one of the fastest growing telecommunications markets in the Middle East and aims to become a Middle Eastern market leader.