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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Worked slate & arts. of slate/agglom. slate | $15,467,187 | $17,506,228 | $21,867,100 | $18,762,341 | $13,693,080 | $16,864,645 | $15,787,765 |
| Total | $15,467,187 | $17,506,228 | $21,867,100 | $18,762,341 | $13,693,080 | $16,864,645 | $15,787,765 |
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