212312 Crushed and Broken Limestone Mining and Quarrying

Official definition

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).

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Producing lime are classified in Industry 327410, Lime Manufacturing.
• Mining or quarrying bituminous limestone are classified in U.S. Industry 212319, Other Crushed and Broken Stone Mining and Quarrying.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 212312

The Census index assigns these 15 activities to this code. If your business matches one, this is your code.

• Agricultural limestone mining and/or beneficiating
• Calcareous tufa crushed and broken stone mining and/or beneficiating
• Cement rock crushed and broken stone mining and/or beneficiating
• Chalk crushed and broken stone mining and/or beneficiating
• Chalk, ground or otherwise treated, mining and/or beneficiating
• Dolomite crushed and broken stone mining and/or beneficiating
• Lime rock, ground, mining and/or beneficiating
• Limestone (except bituminous) crushed and broken stone mining and/or beneficiating
• Limestone beneficiating plants (e.g., grinding or pulverizing)
• Marl crushed and broken stone mining and/or beneficiating
• Riprap, limestone, mining or quarrying
• Riprap, limestone, preparation plants
• Travertine crushed and broken stone mining and/or beneficiating
• Tufa, calcareous, crushed and broken stone, mining and/or beneficiating
• Whiting crushed and broken stone, mining and/or beneficiating

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 212312

To count as a small business for SBA loans and federal contracts under NAICS 212312, your business (including affiliates) must not exceed 750 employees. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 0810, 0891), so treat them as a starting point and check the definition.

• 08910Mining of chemical and fertilizer mineralsUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

• 212311Dimension Stone Mining and Quarrying
• 212313Crushed and Broken Granite Mining and Quarrying
• 212319Other Crushed and Broken Stone Mining and Quarrying