Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 49163 | Kilograms, contained selenium | NA |
| 2004 | 61256 | Kilograms, contained selenium | 24.60% |
| 2005 | 62000 | Kilograms, contained selenium | 1.21% |
| 2006 | 62000 | Kilograms, contained selenium | 0.00% |
| 2007 | 60000 | Kilograms, contained selenium | -3.23% |
| 2008 | 64730 | Kilograms, contained selenium | 7.88% |
| 2009 | 65000 | Kilograms, contained selenium | 0.42% |
