Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 7600 | Kilograms | NA |
| 2003 | 4100 | Kilograms | -46.05% |
| 2004 | 5700 | Kilograms | 39.02% |
| 2005 | 7200 | Kilograms | 26.32% |
| 2006 | 10300 | Kilograms | 43.06% |
| 2007 | 5100 | Kilograms | -50.49% |
| 2008 | 3300 | Kilograms | -35.29% |
| 2009 | 3500 | Kilograms | 6.06% |
| 2010 | 3500 | Kilograms | 0.00% |
| 2011 | 3500 | Kilograms | 0.00% |
| 2012 | 3500 | Kilograms | 0.00% |
