Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2002 | 1477 | Kilograms | NA |
| 2003 | 1543 | Kilograms | 4.47% |
| 2004 | 567 | Kilograms | -63.25% |
| 2005 | 616 | Kilograms | 8.64% |
| 2006 | 432 | Kilograms | -29.87% |
| 2007 | 3023 | Kilograms | 599.77% |
| 2008 | 340 | Kilograms | -88.75% |
| 2009 | 1055 | Kilograms | 210.29% |
| 2010 | 2355 | Kilograms | 123.22% |
| 2011 | 1636 | Kilograms | -30.53% |
| 2012 | 1600 | Kilograms | -2.20% |
