2022 NAICS industry in sector 21 Mining, Quarrying, and Oil and Gas Extraction
21311 Support Activities for Mining
NAICS 21311 is the US industry code for support activities for mining. It covers establishments primarily engaged in providing support services, on a contract or fee basis (except geophysical surveying and mapping, mine site preparation, construction, and transportation activities), required for the mining and quarrying of minerals and for the extraction of oil and gas.
Official definition
This industry comprises establishments primarily engaged in providing support services, on a contract or fee basis (except geophysical surveying and mapping, mine site preparation, construction, and transportation activities), required for the mining and quarrying of minerals and for the extraction of oil and gas. Drilling, taking core samples, and making geological observations at prospective sites for minerals, on a contract or fee basis, are included in this industry.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Performing geophysical surveying and mapping services for minerals (i.e., coal, metal ores, oil and gas, and nonmetallic minerals) on a contract or fee basis are classified in Industry 54136, Geophysical Surveying and Mapping Services.
- Mining, quarrying, and/or beneficiating on a contract or fee basis are classified in Subsector 212, Mining (except Oil and Gas), based on the mineral mined.
- Operating oil and gas field properties on a contract or fee basis are classified in Subsector 211, Oil and Gas Extraction, based on the primary activity.
- Oil and gas pipeline and related structures construction and repair are classified in Industry 23712, Oil and Gas Pipeline and Related Structures Construction.
- Inspecting pipelines (i.e., visual) are classified in Industry 54199, All Other Professional, Scientific, and Technical Services.
- Site preparation and related construction activities on a contract or fee basis are classified in Industry 23891, Site Preparation Contractors.
- Mining machinery and equipment repair and maintenance are classified in Industry 81131, Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance.
- Providing transportation activities on a contract or fee basis are classified in Sector 48-49, Transportation and Warehousing, based on the primary activity.
- Providing landman services on a contract or fee basis are classified in Industry 53139, Other Activities Related to Real Estate.
Codes in 21311
Data last changed November 14, 2026. How this page is built.