Sir: We are very thankful for the constructive comments provided by Kneeshaw and Kepert. Unfortunately, the competitive ownership structure of the iron ore mining industry in the Hamersley province limits our personal knowledge of the Mount Whaleback deposit to occasional mine visits and to the available literature, published and unpublished. We do, however, have access to the data on the smaller Giles Mini and Lido deposits, 50 and 10 km west of Mount Whaleback, respectively, and to extensive exploration mapping in the Ophthalmia Ranges to the north. Direct proof for rotation of the orebody, as it is preserved at Paraburdoo...

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