If like for like, why did you not post SDL's Probable Resource figures?The SDL chart I am looking at gives Probable figure and below it Indicated and Inferred figure. You only chose to publish the latter two not Probable. From the Announcement by SDL on the same page in 2015. First 10 years of production average Product grade 63.1%Fe.
Your figures for Rio Tinto measured resource, nearly 800 million tonnes of their iron ore is below 58%Fe. And 299 million tonnes below 62%Fe, how many mines do they produce from? How many years have they been producing? Several of RIO mines are joint ventures so some of their figures may include others share of iron ore produced and exported.
FMG by the figures you have posted do not have any iron ore above 56.4%Fe, with a total average across Measured, Indicated and Inferred of 56%Fe.
Regards
Westcott.
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