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By 1870 an impressive selection of metal ores had been discovered in New Zealand, but only three metals were successfully mined in 2005 gold, silver and iron. The total value of mining output increased steadily after the Second World War, and exceeded $1 billion for the first time in 2004. The increase was due to changes in mining technology and in the products produced, and to increases in export markets. The main metals that are mined today include: Non metallic minerals industrial development within New Zealand since 1950 has led to construction projects needing large amounts of non metallics, especially aggregate. Iron large reserves of black ironsands on the west coast of the North Island have been known about for 150 years, but it was not profitable to smelt the sand to produce iron and steel until the 1960s. Now New Zealand Steel produces iron and steel for domestic use and for export. Gold because the world price of gold was fixed, production...

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