The objectives of this research project were: 1. to determine the petrological history of the component rocks in the diapir, and, if possible, the origin of the copper found in blocks or rafts of sedimentary rock now included within diapiric breccia at numerous locations which have been worked on a small scale over the historic distant past. 2. to determine the geochemical conditions within the brecciated rock masses and, in particular, the behaviour of copper during tectonic disturbances and also during subsequent erosion and weathering. It was hoped to find the cause of copper anomalies previously identified by company exploration and recent SADM surface geochemical surveys. To concentrate on less weathered parts of the diapir, stored diamond cores were examined and sampled for assay. Literature concerning the geology of diapirs was also studied. It was found that rocks in the Lyndhurst Diapir have been weathered to depths of >500 feet, and petrographic and mineragraphic evidence suggests that surficial copper anomalism arises from the presence in the weathered zone of oxidised secondary copper minerals deposited from circulating supergene solutions during the weathering process.