Tree ferns as biogeochemical survey sample media in gold exploration, Luck at Last Mine, Coromandel, New Zealand

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SR_2017-022-pdf
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Dunn, C.E.; Christie, A.B.; Black, J.A. 2017 Tree ferns as biogeochemical survey sample media in gold exploration, Luck at Last Mine, Coromandel, New Zealand. Lower Hutt, N.Z.: GNS Science. GNS Science report 2017/22 78 p.; doi: 10.21420/G2K30D

 

Abstract: In 2013, a biogeochemical orientation survey was conducted in the vicinity of the former Luck at Last gold and silver mine in the Hauraki Goldfield, Coromandel Volcanic Zone, and located 6 km west of Whangamata township. Several plant species were collected for analysis, of which silver fern (Cyathea dealbata ['ponga'] proved to be the most widespread and diagnostic. In November 2015, the survey was extended over a larger area and involved the collection of foliage samples from an additional 161 stations. Including field duplicates and control samples, a total of 200 samples were analysed by inductively coupled plasma mass spectrometry after reducing the foliage to ash in order to concentrate the elements. Data for 52 elements from these samples were merged with analyses from 29 samples of the same fern species collected previously in 2013. (auth0