Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2003 | 5 | Metric tons | NA |
| 2004 | 9 | Metric tons | 80.00% |
| 2005 | 4 | Metric tons | -55.56% |
| 2006 | 46 | Metric tons | 1,050.00% |
| 2007 | 2 | Metric tons | -95.65% |
| 2008 | 21 | Metric tons | 950.00% |
| 2009 | 12 | Metric tons | -42.86% |
| 2010 | 12 | Metric tons | 0.00% |
| 2011 | 22 | Metric tons | 83.33% |
| 2012 | 21 | Metric tons | -4.55% |
| 2013 | 20 | Metric tons | -4.76% |
