# NAICS 21: Mining, Quarrying, and Oil and Gas Extraction

No SBA size standard is recorded for NAICS 21.

| Field | Value |
| --- | --- |
| Code | 21 |
| Title | Mining, Quarrying, and Oil and Gas Extraction |
| Level | 2 |
| Parent | - |
| Size standard | - |
| Footnote | - |

## Description

The Mining, Quarrying, and Oil and Gas Extraction sector comprises establishments that extract naturally occurring mineral solids, such as coal and ores; liquid minerals, such as crude petroleum; and gases, such as natural gas. The term "mining" is used in the broad sense to include quarrying, well operations, beneficiating (e.g., crushing, screening, washing, and flotation), and other preparation customarily performed at the mine site, or as a part of mining activity.

## 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/21/size-standard?revenue_usd=...
- MCP tools: naics_lookup, size_standard_check

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