212312 — Crushed and Broken Limestone Mining and Quarrying
Description
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) (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 1422 - Crushed and Broken Limestone (via SIC1987:1422→NAICS1997:212312→2002:212312→2007:212312→2012:212312→2017:212312→2022:212312)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 3820 — Mining, Rock Drilling, Earth Boring, and Related Equipment
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 212312 valid in 2022? ▾
Yes, 212312 is a valid 6-digit 2022 NAICS national industry code representing 'Crushed and Broken Limestone Mining and Quarrying' under Sector 21 in the official classification index.
What is the SBA size standard for NAICS code 212312? ▾
The Small Business Administration (SBA) has established a small business size standard of 750 employees for NAICS code 212312 (Crushed and Broken Limestone Mining and Quarrying), calculated based on employees.
What is the legacy SIC equivalent for NAICS 212312? ▾
According to official Census Bureau concordance tables, NAICS code 212312 (Crushed and Broken Limestone Mining and Quarrying) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 1422 - Crushed and Broken Limestone.
Related Pages & Tools
Further regulatory reference links for NAICS code 212312:
- Sector 21 Directory Hub — List of related industries in the Mining, Quarrying, and Oil and Gas Extraction sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 212312 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Crushed and Broken Limestone Mining and Quarrying).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.