NAICS 21231 - Stone Mining and Quarrying

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Key Terms

NAICS 2123 NAICS 212 NAICS 21 dimension stone crushed stone quarrying mining site development stone beneficiation crushing screening government contracting infrastructure materials construction aggregates public works procurement

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Related NAICS Codes for NAICS 21231

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What is NAICS 21231

NAICS code 21231 encompasses establishments engaged in the mining and quarrying of stone resources, including dimension stone and crushed stone. Businesses in this sector are involved in developing mine sites, extracting rough blocks or slabs of stone, and processing these materials through crushing, grinding, washing, and sizing. The industry supports a wide range of infrastructure, construction, and manufacturing projects by providing essential raw materials. Government agencies contract for these services to ensure a reliable supply of high-quality stone products needed for public works, transportation infrastructure, and defense construction projects.

Industry Classification for NAICS 21231

This industry comprises (1) establishments primarily engaged in developing the mine site, mining or quarrying dimension stone (i.e., rough blocks and/or slabs of stone), or mining and quarrying crushed and broken stone and/or (2) preparation plants primarily engaged in beneficiating stone (e.g., crushing, grinding, washing, screening, pulverizing, and sizing).

Breakdown for NAICS 21231

  • Includes mining and quarrying of dimension stone and crushed stone.
  • Covers beneficiation processes like crushing, grinding, washing, and sizing.
  • Serves construction and infrastructure sectors primarily through material supply.
  • Subject to environmental and safety regulations specific to mining operations.
  • Typical business size standards vary but often include small to medium enterprises.
  • Contracts support both material extraction and processing activities.

Included Activities for NAICS 21231

  • Developing and preparing mine sites for stone extraction.
  • Extracting dimension stone blocks and slabs.
  • Mining and quarrying crushed and broken stone.
  • Operating beneficiation plants for stone processing.
  • Crushing, grinding, and washing stone materials.
  • Screening and sizing stone for specific applications.
  • Ensuring compliance with environmental and safety standards.
  • Transporting mined stone to government or contractor sites.

Business Types for NAICS 21231

  • Dimension stone quarry operators
  • Crushed stone mining companies
  • Stone beneficiation and processing plants
  • Construction materials suppliers
  • Environmental and mining compliance consultants
  • Contract mining firms specializing in stone extraction

Government Buyers for NAICS 21231

Federal, state, and local government agencies are the primary buyers of stone mining and quarrying services. Departments such as the U.S. Army Corps of Engineers, Departments of Transportation, and municipal public works offices frequently procure these materials to support road construction, bridge building, military base development, and other infrastructure initiatives. These agencies require dependable suppliers capable of meeting stringent quality and specification standards essential for long-lasting public infrastructure.

Contract Types & Procurement for NAICS 21231

Contracts in this sector typically include firm-fixed-price, indefinite-delivery/indefinite-quantity (IDIQ), and task order contracts. Procurement methods often involve competitive bidding, invitations for bid (IFB), and requests for proposals (RFP) based on project scope and urgency. Contract values can range from small supply contracts for crushed stone to multimillion-dollar agreements for large-scale dimension stone extraction and processing, depending on project size and duration.

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