UNSPSC 11111612: Limestone dust or mine rock dust

A crushed limestone sprayed on surfaces in mines to make coal dust incombustible in case of a gas explosion.

UNSPSC 11111612 Limestone dust or mine rock dust is a Commodity code under which state and local governments procure stone and aggregate materials for infrastructure, maintenance, and construction work—including rip rap, crushed stone, granite rubble, decomposed granite, and other fractured aggregate products. The code sees steady activity across city departments, counties, state transportation agencies, and special districts, with no single issuing body dominating. Solicitations span public works departments (stormwater, roads, bridges), parks and recreation, water utilities, and county highway and transportation divisions. Scope of work is wide: the Wichita Public Works & Utilities Department is procuring 1,560 tons of 18-inch flexible light stone rip rap, 1,900 tons of 24-inch heavy stone rip rap, and 500 tons of 5 x 9 stone for ditch lining to support the Wichita-Valley Center Flood Control Project, with bids due July 10, 2026 under RFB #260112; the City of Huntsville, Texas is requesting road maintenance materials including limestone chip rock and rip rap in various sizes under an estimated $100,000 annual contract with bids due June 25, 2026; and Dane County, Wisconsin issued RFB 2026-RFB-008 for aggregate for surface treatment, requiring 4,100 tons of pea gravel and 3,600 tons of granite or quartzite aggregate for asphalt sealcoat work, with responses due February 23, 2026. Representative recent activity clusters in Kansas, Texas, Wisconsin, California, Georgia, and Colorado, with secondary activity in Arizona, Illinois, Mississippi, and Oregon. Pre-qualification and materials testing are common requirements—bidders often must furnish independent laboratory results demonstrating compliance with state transportation standards (CDOT, TxDOT, FDOT, or Kansas DOT specifications). Contract terms typically run one to three years with optional renewals, and delivery windows range from same-day to fifteen days depending on order size and issuing body. Insurance mandates are standard ($1 million commercial general liability; workers' compensation; auto liability). Geographic preferences appear in some jurisdictions (San Bernardino County applies 5 percent local preference; Madison applies local vendor preference scoring), and prevailing wage applies where federal funding is present.