Story: Marine minerals

Coastal dredging

Coastal dredging

In the North Island at Mangawhai Heads and Kaipara Harbour, aggregate and sand deposits have been dredged for the construction industry. At Waikato North Head and Taharoa, ironsands are mined for steel making. In the South Island, at sites off the West Coast and Otago, there are also thought to be gold deposits left by rivers of the past. The size of the deposits and their exact location are still largely unknown.

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Source: Crown Minerals (data); GNS Science (base map)

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How to cite this page:

Ian Wright, 'Marine minerals - Phosphates, ironsands and sands', Te Ara - the Encyclopedia of New Zealand, (accessed 27 January 2022)

Story by Ian Wright, published 12 Jun 2006