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 covering crushed aggregate materials that state and local governments procure for highway maintenance, road construction, and erosion control—delivered as needed to job sites, maintenance facilities, or project locations. The Mississippi Department of Transportation, Texas Department of Transportation, city public works departments, and county transportation and stormwater agencies are the primary issuing bodies, with repeat purchasing from state DOTs, county road maintenance operations, and municipal street and utilities departments. Work under this code ranges from routine sealed-bid contracts for crushed limestone and aggregate base materials to specialized procurement for riprap, granite rubble stone, and tailored erosion control rock.

Recent solicitations span the South, Southwest, and Upper Midwest. Mississippi Department of Transportation issued RFX 3160008330 for crushed aggregates with bids due November 2, 2026, under an IFB with EEV certification eligibility and MAGIC e-procurement submission; DeSoto County, Mississippi posted two separate sealed bids for crushed limestone and crushed materials in August and September 2026. Texas Department of Transportation solicited 2-inch crushed limestone for highway maintenance under a unit-cost pricing model, with bids due October 16, 2026. The City of Amarillo, Texas issued ITB 267-26 YM for 2,000 tons of rock crusher screenings under local-vendor preference rules, with delivery required within 24 hours of order and pricing quoted per ton F.O.B. destination; the contract runs one year with four optional renewals and is available to governmental entities via cooperative purchasing. The City of Austin procured flexible base, surface rock, and 3x5-inch rock under IFB 5000 MAS1008 with local and small business discounts (five and three percent respectively), requiring bidders to operate a source facility within 100 miles of the city and meet minimum two-year supply experience; pricing uses Producer Price Index adjustments after the first 12 months. Denton County, Texas issued ITB #26-2913 for flexible base (Grade 1, Type A) conforming to 2024 Texas specifications, with delivery restricted to specific county facilities on defined days and times. Recent activity shows steady demand from transportation departments and public works agencies for routine aggregate supply, with contract terms typically one to three years, firm pricing for initial periods, and escalation tied to commodity indices or limited percentage increases thereafter.