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Jenkin, G. R. T.; Lusty, P. A. J.; McDonald, I; Smith, M. P.; Boyce, A. J.; Wilkinson, J. J. (2014). "Ore Deposits in an Evolving Earth"(PDF). Geological Society, London, Special Publications. 393: 265–276. doi:10.1144/SP393.13. S2CID53488911. Archived(PDF) from the original on 2020-01-03. Retrieved 2019-07-04.
West, J (2011). "Decreasing metal ore grades: are they really being driven by the depletion of high-grade deposits?". J Ind Ecol. 15 (2): 165–168. doi:10.1111/j.1530-9290.2011.00334.x. S2CID153886675.
Jenkin, G. R. T.; Lusty, P. A. J.; McDonald, I; Smith, M. P.; Boyce, A. J.; Wilkinson, J. J. (2014). "Ore Deposits in an Evolving Earth"(PDF). Geological Society, London, Special Publications. 393: 265–276. doi:10.1144/SP393.13. S2CID53488911. Archived(PDF) from the original on 2020-01-03. Retrieved 2019-07-04.
Jenkin, G. R. T.; Lusty, P. A. J.; McDonald, I; Smith, M. P.; Boyce, A. J.; Wilkinson, J. J. (2014). "Ore Deposits in an Evolving Earth"(PDF). Geological Society, London, Special Publications. 393: 265–276. doi:10.1144/SP393.13. S2CID53488911. Archived(PDF) from the original on 2020-01-03. Retrieved 2019-07-04.