Sijes is a small town which services a borate mining district. Borate beds intercalated with clays, tuff and sandstone of the Sijes Formation. In part buried under sediments washed down from the western flanks of the Sierra de Sijes.
The borate beds here constitute the world's largest deposit of hydroboracite.
References
- Garrett, D.E. (1998): Borates - Handbook of Deposits, Processing, Properties and Use. Academic Press (San Diego, London), 475 pp.
- Journal of Sedimentary Research 70(3), 664-681.
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