Global refinery production of selenium 2009-2017

* Kilograms of contained selenium
** Revised
Totals and estimated data have been rounded to no more than three significant digits. Insofar as possible, data relate to refinery output only; thus, countries that produced selenium contained in copper ores, copper concentrates, blister copper, and (or) refinery residues but did not recover refined selenium from these materials indigenously were excluded to avoid double counting. Includes data available through June 14, 2019.