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...a's export earnings. Copper is the principal mineral produced, and cobalt, selenium, and precious metals are extracted as byproducts. The region has a diversif

...="[[Gallium|Ga]]";am.Ge="[[Germanium|Ge]]";am.As="[[Arsenic|As]]";am.Se="[[Selenium|Se]]";am.Br="[[Bromine|Br]]";am.Kr="[[Krypton|Kr]]";am.Rb="[[Rubidium|Rb]]"

...ng electrolysis precious metals like [[gold]], [[silver]], [[platinum]], [[selenium]], [[palladium]] etc. settle down along with other impurities at the bottom