Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 83000 | Kilograms, contained selenium | NA |
| 2004 | 82000 | Kilograms, contained selenium | -1.20% |
| 2005 | 84000 | Kilograms, contained selenium | 2.44% |
| 2006 | 74000 | Kilograms, contained selenium | -11.90% |
| 2007 | 70000 | Kilograms, contained selenium | -5.41% |
| 2008 | 78000 | Kilograms, contained selenium | 11.43% |
| 2009 | 70000 | Kilograms, contained selenium | -10.26% |
