212312  Crushed and Broken Limestone Mining and Quarrying 

This U.S. industry comprises (1) establishments primarily engaged in
developing the mine site, mining or quarrying crushed and broken
limestone (including related rocks, such as dolomite, cement rock,
marl, travertine, and calcareous tufa), and (2) preparation plants
primarily engaged in beneficiating limestone (e.g., grinding or
pulverizing). 

The data published with NAICS code 212312 include the following
SIC industry:

1422 Crushed and broken limestone