**Acknowledgements**

This chapter has been published in open access thanks to the support and funding of the Laboratorio de Inspección Técnica de la Escuela de Minas (LITEM) and the University of León (Spain). The authors wish to thank everybody who contributed to the project, especially Sobarriba León 0 and Himalaya Sol, and to the reviewers for increasing the overall quality of the manuscript with their valuable comments.

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