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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 1
Earth Syst. Dynam., 7, 103–117, 2016
https://doi.org/10.5194/esd-7-103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Earth Syst. Dynam., 7, 103–117, 2016
https://doi.org/10.5194/esd-7-103-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Peer-reviewed comment 11 Feb 2016

Peer-reviewed comment | 11 Feb 2016

Comment on: "Recent revisions of phosphate rock reserves and resources: a critique" by Edixhoven et al. (2014) – clarifying comments and thoughts on key conceptions, conclusions and interpretation to allow for sustainable action

R. W. Scholz and F.-W. Wellmer
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Cited articles  
Al-Bassam, K., Fernette, G., and Jasinski, S. M.: Phosphate deposits of Iraq, in: PHOSPHATES 2012, El Jadida, Morocco, 20–23 March, 1–22, 2012.
Australasian Institute of Mining and Metallurgy: Coalfields Geology Council of NSW and Queensland Mining Council, available at: http://www.ausimm.com.au/content/default.aspx?ID=515 (last access: 14 August 2014), 2014.
Belkhadir, A. and Chaoui, M. A.: Phosphates in Morocco, in: Proceedings of the International Conference “Fertilizer '85”, edited by: More, A. I., The British Sulphur Corporation Limited, 231–241, 1986.
Brandt, A. R.: Review of mathematical models of future oil supply: historical overview and synthesizing critique, Energy, 35, 3958–3974, 2010.
Chilés, J.-P. and Delfiner, P.: Geostatistics. Modeling Spatial Uncertainty, Wiley, Hoboken, NJ, 2012.
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The 2014 USGS data could decrease from 67 Gt phosphate rock (PR) reserves to 58.5 Gt marketable PR (PR-M) if data on PR-ore are transferred to PR-M. The 50 Gt PR-M estimate for Moroccan reserves is reasonable. Geoeconomics suggests that large parts of resources and geopotential become future reserves. As phosphate is essential for food production and reserve data alone are unsufficient for assessing long-run supply security, an international standing committee may assess future PR accessibility.
The 2014 USGS data could decrease from 67 Gt phosphate rock (PR) reserves to 58.5 Gt marketable...
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