Analysis
NAICS 212312 is the 2022 national industry for crushed and broken limestone mining and quarrying, part of 21231 (Stone Mining and Quarrying). Census lists 15 example activities under it in the official index.
County Business Patterns counts 1,376 US establishments in this code in 2023, employing 25,735 people at an average annual payroll of $79,452 per employee (68th percentile of national industries). 25% of the establishments have fewer than five employees, which is close to the national mix.
By establishments it ranks 1st of the 4 codes at this level within Stone Mining and Quarrying, with 56.4% of them.
Its index entries, the activities Census uses to assign businesses to this code, include agricultural limestone mining and/or beneficiating, calcareous tufa crushed and broken stone mining and/or…, cement rock crushed and broken stone mining and/or… and chalk crushed and broken stone mining and/or beneficiating, among 15 in all.
Its goods appear in 2 statistical lines of the US tariff schedule, mostly under headings 2509 (). That link is how import data is matched to domestic producers, for example in trade-remedy cases.
For example, producing lime are classified in 327410 (Lime Manufacturing) instead.
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, NAICS 2022 Manual.
Not this code if…
Index entries (15)
- 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