# NAICS 212312: Crushed and Broken Limestone Mining and Quarrying

The SBA size standard for NAICS 212312 is 750 employees (13 CFR 121.201).

| Field | Value |
| --- | --- |
| Code | 212312 |
| Title | Crushed and Broken Limestone Mining and Quarrying |
| Level | 6 |
| Parent | 21231 |
| Size standard | 750 employees |
| Footnote | - |

## 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).

## Sources

- Census NAICS: https://www.census.gov/naics/
- SBA size standards: https://www.sba.gov/document/support-table-size-standards

## API and MCP

- REST: GET https://samgovapi.io/api/v1/naics/212312/size-standard?revenue_usd=...
- MCP tools: naics_lookup, size_standard_check

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