Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 47800 | Kilograms, contained selenium | NA |
| 2004 | 51900 | Kilograms, contained selenium | 8.58 % |
| 2005 | 48800 | Kilograms, contained selenium | -5.97 % |
| 2006 | 49800 | Kilograms, contained selenium | 2.05 % |
| 2007 | 45000 | Kilograms, contained selenium | -9.64 % |
| 2008 | 45000 | Kilograms, contained selenium | 0.00 % |
| 2009 | 45000 | Kilograms, contained selenium | 0.00 % |
