NAICS 212312
Overview
The North American Industry Classification System (NAICS) is the federal standard for grouping business establishments to enable consistent collection, analysis, and publication of U.S. economic statistics. Designed through coordination among U.S., Canadian, and Mexican statistical agencies, NAICS replaced the SIC in 1997 under OMB oversight and has been updated on a five-year cycle, most recently in 2022. 1
NAICS 212312 covers establishments that develop mine sites and mine or quarry crushed and broken limestone (and related rocks) and operate preparation plants that beneficiate limestone by activities such as crushing, grinding, washing, screening, pulverizing, and sizing; lime production and bituminous limestone are explicitly classified elsewhere. 2
See also on G2X:
What this NAICS covers
- Developing limestone mine and quarry sites. 2
- Surface or underground extraction of crushed and broken limestone. 2
- Quarrying and processing of dolomite, cement rock, marl, travertine, and calcareous tufa with limestone operations. 2
- On-site limestone preparation plants (crushing, grinding, washing, screening). 2
- Pulverizing and sizing limestone products. 2
- Beneficiation of limestone associated with quarry operations. 2
Related NAICS and PSC codes
| Type | Code | Descriptor |
|---|---|---|
| NAICS | 212313 | Crushed and Broken Granite Mining and Quarrying |
| NAICS | 212319 | Other Crushed and Broken Stone Mining and Quarrying |
| PSC | 9620 | Minerals, Natural and Synthetic |
| PSC | 5610 | Mineral Construction Materials, Bulk |
Cross‑references and exclusions
- Lime production is classified under NAICS 327410 (Lime Manufacturing), not NAICS 212312. 2
- Bituminous limestone mining is classified under NAICS 212319. 2
- Cement and concrete manufacturing activities reference NAICS manufacturing subsectors; mining or quarrying limestone remains in NAICS 212312. 6
NAICS 2022 implementation notes
Census programs are transitioning to 2022 NAICS through 2027. The 2022 Economic Census and subsequent releases began disseminating data on the 2022 basis, affecting time-series comparability for some industries; Sector 21 experienced content and coding updates. 3
Frequently asked questions
-
What activities fall under NAICS 212312?
NAICS 212312 includes developing mine sites; mining or quarrying crushed and broken limestone and related rocks (e.g., dolomite, marl, travertine); and operating preparation plants for crushing, grinding, washing, screening, pulverizing, and sizing limestone. 2 -
How does NAICS 212312 differ from 212311 and 212313?
NAICS 212311 covers dimension stone (rough blocks/slabs). NAICS 212313 covers crushed and broken granite. NAICS 212312 specifically addresses limestone and closely related calcareous rocks and related preparation activities. 2 -
Are lime or cement manufacturing included in NAICS 212312?
No. Lime production is in NAICS 327410. Cement and ready-mix concrete manufacturing fall under NAICS manufacturing subsectors; mining or quarrying limestone remains in NAICS 212312. 6
See also on G2X: NAICS 327410 -
Which PSCs commonly align with purchases tied to limestone mining and quarrying?
Commonly used PSC families include 9620 (Minerals, Natural and Synthetic) for mineral commodities and 5610 (Mineral Construction Materials, Bulk) for bulk construction aggregates like crushed stone. Always code based on “what is bought.” 4 -
Where is the current SBA small business size standard for NAICS 212312?
SBA publishes size standards by NAICS. The current threshold applicable to NAICS 212312 is shown in SBA’s Table of Size Standards; consult the latest table to confirm the active figure and effective date. 5
Useful resources
- U.S. Census Bureau NAICS industry description for NAICS 212312. 2
- Census: Implementation timeline for 2022 NAICS (transition schedule and affected sectors). 3
- Census: 2022 Economic Census — Industry tables and data access for Sector 21. 7
References
- U.S. Census Bureau — About Industry: overview of NAICS history and five-year updates, including 1997 adoption and 2022 update. https://www.census.gov/topics/employment/industry-occupation/about/industry.html
- U.S. Census Bureau — NAICS 2022 Code 212312: Crushed and Broken Limestone Mining and Quarrying (definition and cross-references). https://www.census.gov/naics/?input=212312&year=2022&details=212312
- U.S. Census Bureau — Implementation of the 2022 NAICS (timeline and scope). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
- U.S. General Services Administration — Product and Service Code (PSC) Manual, April 2025. https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
- U.S. Small Business Administration — Table of size standards (current thresholds by NAICS). https://www.sba.gov/document/support--table-size-standards
- U.S. Census Bureau — NAICS Sectors 31–33 overview and cross-references (manufacturing vs. quarrying). https://www.census.gov/naics/resources/archives/sect31-33.html
- U.S. Census Bureau — Economic Census by Industry (2022 Sector 21 tables). https://www.census.gov/programs-surveys/economic-census/data/tables/industry.html
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