Passage: Papua New Guinea is richly endowed with natural resources, including mineral and renewable resources, such as forests, marine (including a large portion of the world's major tuna stocks), and in some parts agriculture. The rugged terrain—including high mountain ranges and valleys, swamps and islands—and high cost of developing infrastructure, combined with other factors (including serious law and order problems in some centres and the system of customary land title) makes it difficult for outside developers. Local developers are handicapped by years of deficient investment in education, health, ICT and access to finance. Agriculture, for subsistence and cash crops, provides a livelihood for 85% of the population and continues to provide some 30% of GDP. Mineral deposits, including gold, oil, and copper, account for 72% of export earnings. Oil palm production has grown steadily over recent years (largely from estates and with extensive outgrower output), with palm oil now the main agricultural export. In households participating, coffee remains the major export crop (produced largely in the Highlands provinces), followed by cocoa and coconut oil/copra from the coastal areas, each largely produced by smallholders and tea, produced on estates and rubber. The Iagifu/Hedinia Field was discovered in 1986 in the Papuan fold and thrust belt.Former Prime Minister Sir Mekere Morauta tried to restore integrity to state institutions, stabilise the kina, restore stability to the national budget, privatise public enterprises where appropriate, and ensure ongoing peace on Bougainville following the 1997 agreement which ended Bougainville's secessionist unrest. The Morauta government had considerable success in attracting international support, specifically gaining the backing of the International Monetary Fund (IMF) and the World Bank in securing development assistance loans. Significant challenges face Prime Minister Sir Michael Somare, including gaining further investor confidence, continuing efforts to privatise...

Question: What types of minerals make up New Guinea's exports?
gold, oil, and copper