Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 3290 | Kilograms | NA |
| 2003 | 3296 | Kilograms | 0.18% |
| 2004 | 2773 | Kilograms | -15.87% |
| 2005 | 1955 | Kilograms | -29.50% |
| 2006 | 2000 | Kilograms | 2.30% |
| 2007 | 2000 | Kilograms | 0.00% |
| 2008 | 2000 | Kilograms | 0.00% |
| 2009 | 2000 | Kilograms | 0.00% |
| 2010 | 1140 | Kilograms | -43.00% |
| 2011 | 1300 | Kilograms | 14.04% |
| 2012 | 1300 | Kilograms | 0.00% |
