Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 33154 | Kilograms, contained selenium | NA |
| 2004 | 32703 | Kilograms, contained selenium | -1.36% |
| 2005 | 22623 | Kilograms, contained selenium | -30.82% |
| 2006 | 24324 | Kilograms, contained selenium | 7.52% |
