Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 296 | Kilograms | NA |
| 2003 | 356 | Kilograms | 20.27 % |
| 2004 | 527 | Kilograms | 48.03 % |
| 2005 | 713 | Kilograms | 35.29 % |
| 2006 | 1700 | Kilograms | 138.43 % |
| 2007 | 883 | Kilograms | -48.06 % |
| 2008 | 902 | Kilograms | 2.15 % |
| 2009 | 814 | Kilograms | -9.76 % |
