The economy of Tanzania continues to be based primarily on agricultural activity, which accounts for almost half of GDP, provides 85% of exports, and employs 80% of the work force. Industry traditionally featured the processing of agricultural products and light consumer goods. Tanzania has vast amounts of natural resources. It is the third-largest producer of gold in Africa after South Africa and Ghana. Tanzania is also known for the Tanzanite gemstones. The principal exports are gold, coffee, cashews, diamonds and other gemstones, manufactures, and cotton. The principal imports are consumer goods, machinery, transportation equipment, industrial raw materials, crude oil, and foodstuffs. The leading trade partners are China, India, South Africa, and Canada.