Page 344 - NEWGEN21-Proceedings-Full

Wharekirauponga (WKP) Gold Project 5

A low-sulphidation epithermal Au-Ag discovery in New Zealand

Hauraki Goldfield Geological Setting

• Jurassic greywacke & argillite basement

• Overlain by Miocene andesites & dacites

• Intruded, interfingered and overlain by mid - late Miocene rhyolites

• Epithermal vein mineralisation Mid – Late Miocene:

• Youngs southward
• Magmatic arc porphyry-related epithermal gold-silver deposits in the northwest

• Bimodal volcanic rift associated adularia-sericite gold-silver deposits in the central-

southern part of the region.
• More subtle zonation, in part erosional due to a regional SE tilt exposing deeper
levels in the west

• Intruded and overlain by post-mineral Plio-Pleistocene andesites and rhyolites

Near surface indicators: opaline quartz, sinter, fossil flora, chalcedony, vent breccias
Boiling indicators: colloform banding of quartz+chalcedony, lattice-bladed quartz after platy calcite, adularia, chalcedony
Deep boiling: crustiform banding of crystalline quartz
Deep epithermal: crystalline quartz, crustiform banding of base metal sulphides, boxwork & radiating nodular quartz