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Cradle to entry gate Exergy/ Exergy cost Entry gate to exit gate Crepuscular crust Exergy/ Exergy cos Useful products Manuf. costs Man-made stock Product manufact ure Man-made mining and refining process Mining and refining costs Grave to cradle Exit gate to grave Use and dispose of materials Recycling of materials Fuels Recycli ng costs Minerals Mineral deposits Landfills Natural stock Avoided costs/ mineral bonus Reference Environment Natural conc. and refining process Materials dispersion and pollution Crepuscular Earth / Thanatia Zero Exergy SDIMI 2011 Materials Life cycle The thermodynamic properties of the upper continental crust: Exergy, Gibbs free Energy and Enthalpy 1 SDIMI 2011 Trends of exergy costs and ore grade in global mining 2 How can we effectively manage our resources if we do not even know which is the cost of the mineral capital that we are irremediably destroying? www.exergoecology.com Thank you very much for your attention! SDIMI 2011 The exergy decrease of the mineral capital endowment due to raw-material production 3 Results SDIMI 2011 The exergy decrease of the mineral capital endowment due to raw-material production 4