1. Vaughan, D. J. The mastery of iron. Elements 7, 75 (2011).
2. U.S. Geological Survey. Mineral commodity summaries 2011. U.S. Geological Survey, 198 p. (2011).
3. Williams, P. J. et al. Iron oxide copper-gold deposits: geology, space-time distribution and possible modes of origin. Economic Geology 100, 371–405 (2005).
4. Allen, R. L., Lundström, I., Ripa, M., Simeonov, A. & Christofferson, H. Facies analysis of a 1.9 Ga, continental margin, back-arc felsic caldera province with diverse Zn-Pb-Ag-(Cu-Au) sulphide and Fe oxide deposits, Bergslagen region, Sweden. Economic Geology 91, 979–1008 (1996).
5. Jonsson, E., Nilsson, K. P., Hallberg, A. & Högdahl, K. The Palaeoproterozoic apatite-iron oxide deposits of the Grängesberg area: Kiruna-type deposits in central Sweden. In: Nakrem, H. A., Harstad, A. O. & Haukdal, G. (eds.) NGF abstracts and proceedings 1, 88–89 (2010).