- Clays, except kaolin and ball (32)
- Bentonite mining (45)
- Clays (common) quarrying (41)
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- Plastic fire clay mining (2)
- Shale (common) quarrying (19)
- Stoneware clay mining (4)
- Nonclay refractory materials (2)
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- Magnesite mining (4)
- Feldspar mining (6)
- Aplite mining (3)
- Nepheline syenite quarrying (1)
- Dumortierite mining (1)
- Olivine (nongem) mining (1)
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