Mercury is one of the most toxic metals known and no essential role is known for it in either human or animal nutrition [1]. Toxic effects of Hg in localized geographical areas, such as the Almadan deposit in Spain, were well known millennia ago. Global industrial growth during the past two centuries has required mining large quantities of base metals, traditional and artisanal mining of large amounts of Au, and the combustion of large amounts of coal for energy purposes. Mercury is either found embedded in these sources in small quantities or is used in processing ores, as in the case of Au.
https://investorintel.com/sectors/cleantech/cleantech-intel/mercury-global-challenge-immense-proportions/
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