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The impacts of opencast mining on the rivers and coasts of New Caledonia.

Auteurs :
BIRD, E. C. F.
DUBOIS, J. P.
ILTIS, J. A.

Description :
New Caledonia is a reef-fringed mountainous island, with extensive deeply-weathered ultrabasic rock formations which have concentrations of nickel and chromium ores, notably near the base of the weathered mantle. Opencast hilltop mining, initiated in the 19th century, became extensive, especially during the nickel boom of 1965-75, and has generated vast quantities of waste material ranging from boulders down to lateritic clay, much of which has spilled down hillsides into valleys. River channels and sediment loads have been drastically modified, and sedimentation has accelerated in many estuaries and deltaic areas, as well as locally in coastal waters off river mouths. The pattern of impact is traced in each of the river catchments, and at and around each of the river mouths. Reference is made to recent attempts to reduce the dispersal of mining waste, and to manage the mining lanscape in a way that is less destructive to surface stability, soils and vegetation. (E.C.F. BIRD).


Type de document :
Monographie

Source :
VII-53 p., Références bibliographiques : 21 réf.

Date :
1984

Editeur :
Pays édition : Japon, Tokyo, United Nations University

Langue :
Anglais
Droits :
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