Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
| Year | Production | Unit of Measure | % Change |
| 2009 | 4800 | Kilograms | NA |
| 2010 | 4800 | Kilograms | 0.00% |
| 2011 | 5400 | Kilograms | 12.50% |
| 2012 | 5400 | Kilograms | 0.00% |
| 2013 | 5500 | Kilograms | 1.85% |
