NAICS 21 — Mining, Quarrying, and Oil and Gas Extraction
Establishments that extract naturally occurring mineral solids, liquid minerals, and gases. The Mining, Quarrying, and Oil and Gas Extraction sector encompasses 14 six-digit NAICS codes used in federal procurement, representing $189,663,979 in total federal contract spending. Each code within this sector has its own SBA small business size standard, which determines whether a business qualifies as "small" for set-aside and sole-source contract opportunities in that specific industry.
Understanding Sector 21
NAICS sector 21 is one of 20 industry sectors defined by the North American Industry Classification System. The federal government uses these codes to classify contract requirements, determine small business eligibility, and track procurement spending across industries. When a federal agency issues a solicitation, they assign a NAICS code that best describes the principal purpose of the acquisition — this determines the applicable size standard for small business participation.
The codes below are sorted by total federal spending, with the highest-spend industries at the top. Click any code to view detailed spending data, top contractors, and guidance on competing for contracts in that industry.
Six-Digit Codes in Sector 21
| Code | Industry | Federal Spend |
|---|---|---|
| 211130 | Natural Gas Extraction | $39.5M |
| 213112 | Support Activities for Oil and Gas Operations | $39.3M |
| 212114 | Surface Coal Mining | $38.1M |
| 212312 | Crushed and Broken Limestone Mining and Quarrying | $27.3M |
| 212321 | Construction Sand and Gravel Mining | $20.0M |
| 212311 | Dimension Stone Mining and Quarrying | $7.5M |
| 212319 | Other Crushed and Broken Stone Mining and Quarrying | $7.2M |
| 213113 | Support Activities for Coal Mining | $3.7M |
| 211120 | Crude Petroleum Extraction | $2.5M |
| 212313 | Crushed and Broken Granite Mining and Quarrying | $2.0M |
| 212390 | Other Nonmetallic Mineral Mining and Quarrying | $1.6M |
| 213115 | Support Activities for Nonmetallic Minerals (except Fuels) Mining | $394K |
| 212290 | Other Metal Ore Mining | $392K |
| 212322 | Industrial Sand Mining | $108K |
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What is NAICS sector 21?
NAICS sector 21 covers Mining, Quarrying, and Oil and Gas Extraction. Establishments that extract naturally occurring mineral solids, liquid minerals, and gases. It contains 14 six-digit industry codes used in federal procurement.
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How much does the federal government spend in sector 21?
Total federal contract spending across all codes in the Mining, Quarrying, and Oil and Gas Extraction sector is approximately $189,663,979. Individual codes within the sector range from the most active at $39.5M to smaller niche markets.
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How do NAICS sectors relate to size standards?
Each six-digit NAICS code has its own SBA size standard — sectors don't have a single standard. Size standards are expressed either as maximum average annual receipts (e.g., $41.5 million) or maximum number of employees (e.g., 500 employees). Click into any six-digit code to see its specific size standard.
Data sourced from USASpending.gov and Census Bureau . Federal contracting data is public domain.