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People use volcanic products as building or road-building materials,
as abrasive and cleaning agents,
and as raw materials for many chemical and industrial uses.
Most of the metallic
minerals mined in the world,
such as copper, gold, silver, lead, and zinc,
are associated with magmas
found deep within the roots of extinct volcanoes located
above subduction zones.
-- Excerpts from: Robert I. Tilling, 1985, Volcanoes:
USGS General Interest Publication; and
Kious and Tilling, 1996, This Dynamic Earth: The Story of Plate
Tectonics: USGS General Interest Publication
Auckland's (New Zealand)
volcanoes are of special significance to the region.
In the recent past, several of the volcanoes have been quarried for
basalt and scoria, which has been used in the construction of the
airport, buildings, pathways and roads. As a result, some of the
landforms have either completely disappeared or are not easily
recognizable (e.g. Ericsson Stadium). Some volcanoes are still
being quarried; for example the Winstone Quarry at Mount Wellington
still extracts basalt from one of the main lava flows.
-- Excerpt from:
The Volcanoes of Auckland Website, June 2001
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