Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 733973 | Kilograms, contained selenium | NA |
| 2004 | 599170 | Kilograms, contained selenium | -18.37% |
| 2005 | 624630 | Kilograms, contained selenium | 4.25% |
| 2006 | 730100 | Kilograms, contained selenium | 16.89% |
| 2007 | 805600 | Kilograms, contained selenium | 10.34% |
| 2008 | 754000 | Kilograms, contained selenium | -6.41% |
| 2009 | 780000 | Kilograms, contained selenium | 3.45% |
