Bignall, G. 2016 Statement of evidence of Dr. Gregory Bignall for Northland Regional Council and Far North District Council hearing concerning a resource consent application by Ngawha Generation Ltd for expanded operation of Ngawha Geothermal Field : public hearing in Kerikeri on 10-14 August 2015. Lower Hutt, N.Z.: GNS Science. GNS Science report 2016/07 22 p.
Abstract: Purpose and scope of evidence: to describe the geology of the Ngawha area (including its subsurface stratigraphy, geological structure and hydrothermal alteration) based on the results of past geothermal drilling and geological surface mapping in the area. These are factors which must be taken into consideration when establishing the conceptual model of the Ngawha geothermal system and determining its reservoir parameters, both for numerical (simulation) modelling of the reservoir in response to development and for assessing potential effects of fluid abstraction and injection. (auth)