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).
Overview Facts
| NAICS Code | 212312 |
|---|---|
| Industry Title | Crushed and Broken Limestone Mining and Quarrying |
| SBA Size Standard | 750 employees |
| U.S. Establishments | 1,376 (Census CBP, 2023) |
| IRS PBA Code | 212310 (rolled-up match) |
| Sectors Hierarchy | Sector 21 → 212 → 2123 |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
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)
Related Resources & Compliance Guides
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.
- 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.
Related Industries in 2123
Frequently Asked Questions (FAQ)
Is 212312 a valid 2022 NAICS code?
NAICS 212312 is 'Crushed and Broken Limestone Mining and Quarrying', a 2022 U.S. national industry under Sector 21 (Mining, Quarrying, and Oil and Gas Extraction); the SBA small-business size standard is 750 employees.
What is the SBA size standard for NAICS 212312?
The SBA small business size standard for NAICS 212312 is 750 employees (based on employees).
What is the legacy SIC code mapping for 212312?
NAICS code 212312 maps to the legacy 1987 SIC codes: 1422 - Crushed and Broken Limestone.