What I have learnt from SDL, page-127

I would like to brainstorm the definition of "world class" in the context of an iron ore resource.
I believe the criteria should include the following:
Size, grade, geography, access to infrastructure, political factors, access to skilled labour, extraction costs, proximity to markets and I guess selling price but concede this one could be questionable.
Given the criteria can anyone truly say SDL have a "world class" resource.