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Mechanical investigations of the Macraes Mine

Figure 1: stress ratios across the lateral ramp modelled by Upton et al. (2007) Figure 1: stress ratios across the lateral ramp modelled by Upton et al. (2007) Figure 2: Positive volume strain and lowered differential stress predicted by 3D models discussed in Upton et al. (2007) Figure 2: Positive volume strain and lowered differential stress predicted by 3D models discussed in Upton et al. (2007) Figure 3: Development of localisation in a model with reaction softening due to graphite deposition (Upton and Craw) Figure 3: Development of localisation in a model with reaction softening due to graphite deposition (Upton and Craw)

This  project involved Phaedra Upton, Dave Craw and Mike Begbie (OceaniaGold Ltd).

Also, please visit the Macraes Mine web pages for more information on department-wide research efforts at Macraes.

We have used three-dimensional mechanical models to investigate:

  1. Mechanical controls on extensional shear vein formation within a thrust zone at Macraes (fig1&2)
  1. The effect of deposition of graphite on localisation of shear within a midcrustal shear zone (fig3)

Presentations

Upton, P. and Craw, D. (2007) Modelling shear development at the Macraes mine, Otago Schist. AusIMM New Zealand Branch Annual Conference, Christchurch New Zealand, 12-15 August 2007

Publications

*Upton, P. *and Craw, D., (2008) Modelling the role of graphite in development of a mineralised midcrustal shear zone, Macraes mine, New Zealand. /Earth and Planetary Science Letters./ *266*, 245-255

*Upton, P., *Begbie, M. and Craw, D., (2008) Numerical modelling of mechanical controls on coeval steep and shallow dipping auriferous quartz vein formation in a thrust zone, Macraes mine, New Zealand.
Mineralium Deposita DOI 10.1007/s00126-007-0148-0