Indonesia's mineral resources were dominated by crude petroleum and natural gas but included significant reserves of coal, tin, nickel, copper, gold, and bauxite. Much industrial development was based on increased domestic processing of oil and natural gas. Most mineral production was exported after some degree of domestic processing to industrial nations, primarily Japan. In some cases, Indonesia's own mineral intensive industries, such as steel and aluminum, relied on imports of raw materials. Krakatau Steel imported about 2 million tons of high-grade iron ore in 1989, and P.T. Indonesia Asahan Aluminum imported 360,000 tons of alumina from Australia. On balance, however, Indonesia was a net exporter of minerals in large part because of petroleum exports. In 1989 the total value of mineral exports was US$10 billion, almost 90 percent of which was oil or liquefied natural gas; mineral imports were only US$1.4 billion.
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