Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 40000 | Kilograms, contained selenium | NA |
| 2004 | 55000 | Kilograms, contained selenium | 37.50 % |
| 2005 | 11000 | Kilograms, contained selenium | -80.00 % |
| 2006 | 11000 | Kilograms, contained selenium | 0.00 % |
| 2007 | 8000 | Kilograms, contained selenium | -27.27 % |
