From 1970 onward, major mineral discoveries transformed the economy of Papua New Guinea from one dependent on tropical crops to one based on minerals for most of its exports. Large deposits of gold or of gold and copper led to major developments at Panguna on Bougainville, at Ok Tedi in the Star Mountains in the western mainland area, on Misima Island in Milne Bay, at Porgera in Enga province, and on Lihir Island, northeast of New Ireland. Misima was mined out and shut down in 2005, and production was predicted to be reaching its end at the giant Porgera and Ok Tedi mines in the first decades of the 21st century.

After 70 years of exploration, major natural gas and crude oil finds were made in the late 1980s; oil and gas production began near Lake Kutubu and Tari in 1992. A large-scale liquefied natural gas project was begun in the southwestern slopes of the main range in 2009. Hydroelectric power supplies Port Moresby, the Highlands region, Lae, and Madang, on the north coast.

Major resource exploitation has caused local landowner groups to contest, principally with the national government, the distribution of mineral revenues. Serious environmental damage from mine tailings has been a constant problem in several projects. Beginning in 1988, dispute over those issues was one factor that led to open warfare around the Panguna mine, causing not only the mine’s closure but also a renewal of hostilities among the inhabitants of Bougainville in what had been a long-dormant secession movement. A peace process began in 1997. Despite that major upheaval, Papua New Guinea experienced a mining boom early in the 21st century; several new mines opened during that time, with income from mining and quarrying providing about one-fourth of the gross domestic product. Gold and copper made up some two-thirds of the value of exports.

Manufacturing

Industrial output is of little significance, accounting for less than one-tenth of gross domestic product despite the government’s attempts to promote its expansion. Aside from the processing of palm oil, manufacturing activities are centred chiefly in Lae and Port Moresby; products include processed food, beverages, tobacco goods, wood products, textiles, and metal goods. The rapid construction of liquefied natural gas projects has dramatically boosted the economies of both cities, although inflation and shortages of housing and skilled personnel have worsened.

Finance

The kina, introduced several months before Papua New Guinea gained independence, is the country’s currency. The central bank is the Bank of Papua New Guinea. The value of the kina increased greatly following independence, but the secession crisis in Bougainville in 1989 and poor fiscal control resulted in major devaluation through the 1990s. Over the next decade, responsible financial management was restored and the central bank strengthened. Papua New Guinea has had a small stock exchange since the late 1990s, but many of the companies traded—chiefly mining, oil, and financial concerns—are foreign-based.

Trade

Papua New Guinea generally has a positive balance of trade, and foreign reserves have grown since 2005. The principal destinations for exports, principally gold and copper, are Australia, Japan, and China. Australia consistently supplied nearly half of the country’s imports in the decades following independence, although that proportion decreased to about one-third in the early 21st century. Gold exports generally brought trade with Australia into surplus. Major imports include machinery and transport equipment, refined petroleum, and foodstuffs.

Services

New Guinea’s spectacular scenery and dynamic cultures provide great potential for the tourist sector. That potential has been limited, however, by a number of factors. The costs of accommodations and air travel from abroad are generally high. In addition, the country’s longtime concerns about personal security have inhibited both local and foreign tourists from traveling on the mainland. Adventure and environmental tourism have grown, however, notably in the island region.

Labour and taxation

Employment in the commercial sector has grown slowly since independence (and even declined in the 1980s and ’90s). Formal salaried work employs only about one-tenth of the adult workforce. The proportion of women in salaried work is very low. Basic wages are higher than in most of Southeast Asia, but productivity is relatively low. There is a shortage of people able to perform skilled work, which is concentrated in the capital and in mining areas, and the shortfall is made up by thousands of foreign workers. The government has had little success in encouraging rural village-based development aimed at reducing migration to urban areas by people seeking formal employment.

Foreign investment and taxes thereon have dominated the cash economy and government receipts since independence, and there has been low revenue from the formal sectors of growth in agricultural commodities, except palm oil. The small size of the salaried workforce limits the personal income tax base, and the bulk of tax revenue comes from company taxes. A 10 percent goods-and-services tax (GST) is the main form of taxation on the great majority of the population. The GST only makes a modest contribution to state revenues, even though 60 percent of it is returned to the province of origin.

Transportation and telecommunications

Internal transport in Papua New Guinea is expensive, whether to the island provinces or by road on the geologically unstable mainland. There are no railroads and few paved roads. Port Moresby is connected by road to only two other provinces and not to any other major population centres. The port city of Lae is linked to Madang on the north coast, and the Okuk (Highlands) Highway connects Lae to the major Highland towns and the Tari gas fields, but it is occasionally blocked for days because of landslides and inadequate maintenance. The rural road network, already in poor repair, is often damaged by heavy rainfall.

For places not served by the Highlands road network, air transport is required to travel between the small towns of each province and between Port Moresby and other population centres. Overseas air access is via the international airport at Port Moresby. Papua New Guinea previously had more regularly operative airstrips per 1,000 population than almost any other country in the world, but the number of small airstrips serving remote outstations fell off rapidly in the late 20th and early 21st centuries. Reasons for the decline included the expansion of the road network, lack of funding, and a reduction in government staffing and official air charters.

Electronic media expanded dramatically in the early 21st century, with a network of cellular telephone transmitters covering all heavily populated areas and even remote regions. Cellular phone usage far surpasses the use of landlines. Computer usage is low, however, partly because of the lack of infrastructure. Although only a small proportion of the population has access to the Internet, it is used extensively by those who do, notably political bloggers.