This graph shows the remarkable increase in opencast mining in the 50 years after the Second World War. By the 2000s only about 20% of New Zealand’s annual coal production came from underground mines. The last underground mine closed in 2017.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Source: Annual production reports, Mines Department, Ministry of Energy, Crown Minerals, Ministry of Economic Development.
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