The data published with NAICS code 212324 include the following SIC industry:
1455 Kaolin and ball clay
This definition comes from the 1997 NAICS manual. However, for this industry, the 1997 Economic Census Mining did not fully implement the conversion to NAICS. Data for NAICS industry 212324 do not include establishments only engaged in beneficiating or preparing kaolin and ball clay. The NAICS definitions will be fully implemented with the 2002 Economic Census.