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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Manganese dioxide | $16,909,000 | $18,135,000 | $18,689,000 | $25,992,000 | $33,330,000 | $27,280,204 | $30,254,816 |
| Manganese oxides other than manganese dioxide | $2,357,000 | $2,284,000 | $2,582,000 | $6,188,000 | $3,632,000 | $5,858,533 | $5,579,089 |
| Total | $19,266,000 | $20,419,000 | $21,271,000 | $32,180,000 | $36,962,000 | $33,138,737 | $35,833,905 |
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