Story: Mining and underground resources

Copper staining, Kawau Island (1st of 2)

Copper staining, Kawau Island

Weathering of copper-bearing minerals produces a wide halo of staining (called a gossan) by secondary copper minerals – often blue-green malachite as in this rock on Kawau Island. The presence of such copper staining is a useful exploration tool, but the presence of economic amounts of ore can only be tested by drilling down into unweathered rock.

Using this item

Private collection
Photograph by Eric Coppard

This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.

All images & media in this story

How to cite this page:

Simon Nathan, 'Mining and underground resources - Metals known but not mined', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/photograph/9241/copper-staining-kawau-island (accessed 20 October 2020)

Story by Simon Nathan, published 12 Jun 2006