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3. Geochemistry and deposits
In the earth's crust, the average concentration (or "clarke") of bismuth is around 0.2 g/tonne, with a higher abundance in the continental crust than in the mantle. .
The geochemical behavior of bismuth is chalcophilic, like that of Sb or As. It also combines with sulfur, selenium, tellurium and other chalcophilic metals, such as Pb and Zn.
3.1 Classification of deposits by origin
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Hydrothermal deposits
In the following, we adopt the classic classification of hydro-thermal deposits...
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