What makes NN such an outstanding ore body is its geometry. From my understanding there should be very little mining dilution as mining widths should be comfortably in excess of minimum mining widths meaning that we should see a very healthy resource to reserve conversion ratio. Upwards of a 70% conversion ratio would not be a surprise. Simon has publicly stated that he is expecting to see a high conversion ratio.
Here's an example of a healthy resource to reserve conversion ratio. WAF's M1 and NN have similar geometrical characteristics.
M1 Measured and Indicated resource = 919k ounces M1 Proved and Probable reserve = 696k ounces Resource to Reserve conversion ratio = 75%
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