3D modelling of epithermal Au-Ag mineralisation at Golden Cross, Hauraki Goldfield, New Zealand

AUTHORS: A.B. Christie, R. Carver

ABSTRACT: Legacy geological and geochemical data have been compiled to enable 3D modelling of the epithermal mineralisation at the former Golden Cross Au-Ag mine in the Hauraki Goldfield and Coromandel Volcanic Zone, New Zealand. Preliminary analyses of drill hole assay data shows that Au (n = 74,115) and Ag (n = 74,566) exhibit good correlation (r = 0.70). The Au/Ag ratio has a mean of 0.25. As (n = 9797) and Sb (n = 9649) have a good correlation (r = 0.69), but are poorly correlated with Au and Ag. Cu (n=2873), Pb (n=2866) and Zn (n=2869) are present in low concentrations. Au and Ag concentrations and Au:Ag ratios peak in a depth range of RL 125-200 defining a main Au-Ag depth zone. As and Sb concentrations peak above and below this main Au-Ag depth zone.

KEYWORDS: Golden Cross, epithermal, gold, silver, 3D, database, geological modelling

EAN: SGA_2013_A015
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