Northern Buller power scheme, proposed dam sites, Karamea River - preliminary geological inspection. November 1973

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Coleman, A.C. 1973 Northern Buller power scheme, proposed dam sites, Karamea River - preliminary geological inspection. November 1973. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report EG 180 6 p.

Abstract: The dam site investigated is in the lower Karamea River approximately 1200m upstream from where the river leaves its main gorge (grid ref. 667327). The gorge is narrow, steep sided and extends for approximately 13km up the river from the proposed dam site. It is incised in granite along its entire length. At the mouth of the gorge the granite is separated by the Kohaihai Fault from Tertiary siltstones and sandstones. Old and young river terraces, a marine bench and recent alluvium overlie the Tertiary rocksand form the coastal plain of the Karamea Area. In the area of the proposed dam site the gorge is asymmetrical, the south side being very steep and generally scrub covered while the north side is only moderately steep with mainly bush cover. On the south side of the river there have been numerous slips and rockfalls while on the northern side rockfalls have not occurred and slipping has been minor in the region of the dam site. (auth)