Stone Mining and Quarrying

NAICS 21231 (Stone Mining and Quarrying) involves the extraction, processing, and supply of various stone, gravel, and aggregate materials used in construction, infrastructure development, and maintenance projects. These materials include limestone, riprap, crushed stone, base course stone, and other mineral construction materials. Quarrying operations typically involve extracting raw materials from surface mines, processing them through crushing and screening, and preparing them for commercial and government use.

Federal contract awards under this NAICS code are predominantly issued by military engineering units, specifically the U.S. Army Corps of Engineers, and the Department of the Interior's Fish and Wildlife Service. Contract values range from approximately $50,000 to $2,000,000, with performance periods typically spanning 3-12 months. Most awards are set aside for small businesses, with a size standard of 500-750 employees. Common places of performance include national wildlife refuges, military bases, and infrastructure repair sites across the United States, with significant activity in states like Louisiana, Washington, Texas, and Minnesota.

Recent federal contract opportunities focus on delivering specific quantities of aggregate materials for infrastructure maintenance and repair projects. Typical requirements include limestone, riprap, crushed stone, and base course materials, with quantities ranging from 634 to 40,000 tons. Key agencies issuing solicitations include the U.S. Fish and Wildlife Service, U.S. Army Corps of Engineers, and Department of Defense installations. Delivery locations span multiple states, with projects involving levee repairs, road maintenance, research facility requirements, and national wildlife refuge infrastructure improvements. Most opportunities are small business set-asides with delivery periods between August and December 2024.