421520  Coal and Other Mineral and Ore Wholesalers 

This U.S. industry comprises establishments primarily engaged in 
wholesaling coal, coke, metal ores, and/or nonmetallic minerals 
(except precious and semiprecious stones and minerals used in 
construction, such as sand and gravel). 

The data published with NAICS code 421520 include the following 
SIC industry:

       5052  Coal and other minerals and ores