Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 22000 | Kilograms, contained selenium | NA |
| 2004 | 22000 | Kilograms, contained selenium | 0.00% |
| 2005 | 32880 | Kilograms, contained selenium | 49.45% |
| 2006 | 33000 | Kilograms, contained selenium | 0.36% |
| 2007 | 33000 | Kilograms, contained selenium | 0.00% |
