Source: United States Geological Survey (USGS) Minerals Resources Program
Note: Check source table for details and footnotes
Year | Production | Unit of Measure | % Change |
2002 | 140000 | Metric tons, gross weight | NA |
2003 | 140000 | Metric tons, gross weight | 0.00 % |
2004 | 140000 | Metric tons, gross weight | 0.00 % |
2005 | 140000 | Metric tons, gross weight | 0.00 % |
2006 | 140000 | Metric tons, gross weight | 0.00 % |