NAICS 333131 Quarterly Industry Report
Mining Machinery and Equipment Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 333131Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report covers NAICS 333131 (Mining Machinery and Equipment Manufacturing) using the 2022 North American Industry Classification System. Data sources include the U.S. Census Bureau[4] NAICS classification documentation, Bureau of Labor Statistics[5] employment data for machinery manufacturing, and SBA size standard tables. Content addresses industry structure, product scope, and market dynamics for establishments primarily engaged in manufacturing underground mining equipment and mineral processing machinery.
Industry Definition & Overview
Mining Machinery and Equipment Manufacturing (NAICS 333131) encompasses establishments primarily engaged in manufacturing underground mining machinery and equipment, such as coal breakers, mining cars, core drills, coal cutters, rock drills, and mineral beneficiating machinery. Per the Census Bureau[4], this classification covers equipment designed for underground extraction operations and mineral processing, distinguished from surface mining equipment classified under NAICS 333120.
Manufacturing operations combine heavy steel fabrication, precision machining, hydraulic system assembly, and electrical control integration. Equipment must withstand harsh underground conditions including confined spaces, dust, moisture, and explosive atmospheres. Safety requirements drive engineering specifications for explosion-proof electrical systems, fire suppression integration, and structural reinforcement. Workforce demands span welding, heavy machining, electrical assembly, and field service disciplines. Skilled labor availability directly affects production capacity.
Geographic concentration follows mining activity patterns. Facilities cluster in Pennsylvania, West Virginia, and Kentucky near coal mining operations, and in states with metal mining including Arizona, Nevada, and Minnesota. According to BLS data[5], machinery manufacturing employment distributes across regions with established mining industries. Raw material inputs include heavy steel plate, hydraulic components, electric motors, conveyor belting, and specialized alloys for wear-resistant applications. Customer relationships are long-term, with equipment manufacturers providing ongoing parts support and rebuild services throughout equipment lifecycles.
What's Included in This Industry
- Coal breakers and crushers for underground operations
- Rock drills and coal cutting machines
- Core drilling equipment for mineral exploration
- Mining cars, shuttle cars, and underground haulage vehicles
- Roof bolting machines and ground support equipment
- Mineral beneficiating and ore processing machinery
- Underground conveyors and material handling systems
- Continuous mining machines and longwall equipment
- Underground mining locomotives and transport systems
- Parts, attachments, and rebuild components for mining equipment
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Machinery Manufacturing | 333 |
| Industry Group | Agriculture, Construction, and Mining Machinery Manufacturing | 3331 |
| NAICS Industry | Mining and Oil and Gas Field Machinery Manufacturing | 33313 |
| National Industry | Mining Machinery and Equipment Manufacturing | 333131 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 333120 | Construction Machinery Manufacturing | Manufactures construction and surface mining machinery including bulldozers, excavators, and off-highway trucks, distinguished from underground mining equipment by surface operational focus and different safety requirements |
| 333132 | Oil and Gas Field Machinery and Equipment Manufacturing | Produces oil and gas field machinery including drilling rigs and wellhead equipment, sharing drilling technology expertise but serving petroleum extraction rather than mineral mining applications |
| 333922 | Conveyor and Conveying Equipment Manufacturing | Manufactures conveyor and conveying equipment used in mining material transport, representing a key component supply relationship where conveyor systems integrate with underground mining equipment installations |
| 333241 | Food Product Machinery Manufacturing | Produces industrial pumps and pumping equipment used in mine dewatering, slurry transport, and mineral processing operations, serving as essential auxiliary equipment for mining installations |
| 332111 | Iron and Steel Forging | Performs iron and steel forging operations producing bucket teeth, drill bits, and wear-resistant components that serve as critical consumable and replacement inputs for mining equipment operations |
| 333612 | Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing | Manufactures speed changers, drives, and gear assemblies used in mining equipment drivetrains, crushers, and conveyor systems, providing critical power transmission components for underground machinery |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | West Virginia | 10.7% | 27 |
| 2 | Pennsylvania | 9.9% | 25 |
| 3 | Texas | 9.5% | 24 |
| 4 | Utah | 6.3% | 16 |
| 5 | Illinois | 6.0% | 15 |
| 6 | Virginia | 5.6% | 14 |
| 7 | Arizona | 4.4% | 11 |
| 8 | California | 4.4% | 11 |
| 9 | Oklahoma | 3.6% | 9 |
| 10 | Kentucky | 3.6% | 9 |
% Of Establishments
0%
11%
Source: County Business Patterns, U.S. Census Bureau[3]
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 333131?
NAICS 333131 classifies establishments primarily engaged in manufacturing underground mining machinery and equipment. Products include coal breakers, rock drills, coal cutters, mining cars, continuous miners, longwall equipment, roof bolters, and mineral beneficiating machinery. The Census Bureau[4] distinguishes this from surface mining and construction equipment (NAICS 333120) and oil field machinery (NAICS 333132).
How is the mining machinery manufacturing industry structured?
A small number of multinational manufacturers dominate production of large underground mining systems including continuous miners, longwall equipment, and shuttle cars. Mid-size firms specialize in drilling equipment, roof bolting machines, or mineral processing systems. Smaller manufacturers produce replacement parts, wear components, and specialty attachments. Equipment rebuild and remanufacturing operations extend equipment life and represent a parallel market alongside new equipment sales.
What is the SBA size standard for mining machinery manufacturers?
The SBA sets the size standard at 500 employees for NAICS 333131. Firms at or below this threshold qualify as small businesses for federal contracting preferences and SBA lending programs. Details appear in the SBA size standards table[6].
What NAICS codes are closely related to mining machinery manufacturing?
NAICS 333120 covers surface mining and construction equipment. NAICS 333132 covers oil and gas field machinery. Larger 333922 covers conveyor systems used in mining material transport. NAICS 333241 covers pumping equipment for mine dewatering. These adjacent codes reflect shared engineering capabilities and component supply chains with underground mining equipment production.
What industries depend on mining machinery manufacturers?
Coal mining operations purchase continuous miners, shuttle cars, and roof bolting equipment. Metal ore mining requires rock drills, load-haul-dump vehicles, and crushing equipment. Nonmetallic mineral operations use beneficiating machinery and processing systems. According to BLS data[5], mining machinery manufacturing employment supports parts distribution, field service, and equipment rebuild operations serving all mining segments.
What activities does NAICS 333131 include?
Covered products include coal breakers, rock drills, coal cutters, mining cars, shuttle cars, continuous miners, longwall systems, roof bolters, mineral beneficiating equipment, and underground conveyors. Manufacturing activities span heavy fabrication, precision machining, hydraulic assembly, and electrical system integration. Excluded items include surface mining bulldozers and excavators (NAICS 333120) and oil field drilling rigs (NAICS 333132).
Are mining equipment manufacturers eligible for SBA loans?
Yes, manufacturers meeting the 500-employee threshold qualify for SBA 7(a) loans, 504 loans, and federal contracting set-asides. The SBA funding programs[9] page details eligibility for manufacturing businesses seeking capital for production equipment, facility expansion, and working capital needs.
Where is mining machinery manufacturing concentrated in the United States?
Pennsylvania, West Virginia, and Kentucky host facilities near Appalachian coal mining operations. Arizona and Nevada support equipment manufacturing near copper and gold mining districts. Minnesota serves iron ore mining in the Mesabi Range. BLS employment data[5] shows mining machinery manufacturing employment concentrating in states with active mining operations, where proximity to customers supports equipment delivery, service, and parts availability.
Sources & References
Government datasets and editorial sources used in this report.
- [1]U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages bls.gov
- [2]U.S. Census Bureau, Economic Census census.gov
- [3]U.S. Census Bureau, County Business Patterns census.gov
- [4]Census Bureau census.gov
- [5]BLS data bls.gov
- [6]Small Business Administration sba.gov
- [7]SBA 7(a) loans sba.gov
- [8]504 loans sba.gov
- [9]SBA funding programs sba.gov
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