Shimmer: I am agreeable with regard to the return profile of MKO being quite unusual... asymmetric & skewed towards the upside, with downside capped by virtue of the Bronzewing plant.
One data point suggesting the Bronzewing's replacement value is much higher than $60 million is MKO's 25 November AGM presentation:
Based on that the plant has a replacement value of $80 million, rather than $60 million.