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Numerical models have been run to evaluate the key parameters that affect fluid flow and gold mineralization at a range of scales, from the full thickness of the crust to the mineral grain scale. These models are constrained with real examples of orogenic gold in southern New Zealand. Large scale modelling shows that differences in crustal strength and thickness affect the locus, scale, and rate of crustal fluid flow and hence influence gold deposition. The most vigorous hydrothermal activity and gold mineralization occurs in narrow zones with maximum uplift close to a major crustal boundary. Relatively strong middle crust...

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