Drill core from the Golden Cross epithermal gold-silver deposit, Coromandel region, New Zealand

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SR_2001-025-pdf
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Christie, A.B.; McOnie, A. 2001 Drill core from the Golden Cross epithermal gold-silver deposit, Coromandel region, New Zealand . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2001/25 13, [236] p.

Abstract: The Golden Cross epithermal gold-silver deposit is located 8 km northwest of Waihi in the Coromandel region, North Island, New Zealand. The deposit is hosted in Miocene andesite and dacite. A recent phase of gold-silver mining at Golden Cross ceased in 1998 and the company, Coeur Gold New Zealand Limited, decided to dispose of all drill core collected from the mine area. Crown Minerals of the Ministry of Economic Development obtained skeleton core from 494 drill holes and full half core from 11 drill holes for their core library in Paeroa. The Geology Department of The University of Auckland retained half core from 9 drill holes. The Institute of Geological and Nuclear Sciences (GNS) undertook an appraisal, in several stages, of the drill core offered. The selection was carried out to complement the material retained by Crown Minerals and to provide: (1) adequate horizontal and vertical distribution of drill holes in the deposit, (2) a representative section of the stratigraphy, and (3) information on the transition from the underground mine section to the open-pit. Individual holes were appraised on the basis of the GNS core selection criteria. In the final selection stage in Lower Hutt, material was discarded mostly on the basis of its poor condition. GNS finally selected 36 holes for retention and storage in the Hutton Building, Gracefield, Lower Hutt. Of these, the full length of half core were retained for 15 holes and partial lengths for 21 holes were retained, giving a total of approximately 2150 core-length metres. (auth)