U.S. imports of Limestone Mining & Quarrying (NAICS 212312) totaled $89K in August 2026, imported from 12 countries.
Importers of Limestone Mining & Quarrying paid $17K in duties in August 2026, an average duty rate of 29.93% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Limestone Mining & Quarrying imports of $89K in August 2026 ran 21% below the year-to-date monthly average of $112K.
Last updated: August 2026 dataCalcium carbonate-rich limestone is one of the most widely extracted nonmetallic minerals, serving as a primary raw material for cement, lime, steel flux, glass, and agricultural soil amendment. The mineral's chemical purity — measured by CaCO₃ content — determines whether a shipment is classified as cement-grade, chemical-grade, or agricultural limestone, each potentially falling under a different HTS heading. Domestic US production is substantial, but high-purity chemical-grade limestone and certain specialty lime products are regularly imported to meet industrial specifications.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
23 import shipments a month
Crude or roughly broken limestone typically falls under HTS Chapter 25, while calcined lime (quicklime or hydrated lime) moves to Chapter 28 as a chemical product. The degree of processing and the CaCO₃ purity level are both relevant to classification, and importers should confirm the correct heading with a licensed customs broker to avoid misclassification between mineral and chemical chapters.
Steel manufacturing (flux-grade limestone), water treatment (hydrated lime), chemical production (high-purity calcium carbonate), and environmental compliance applications (flue-gas desulfurization) are the primary industrial consumers. Agricultural lime demand is largely met domestically due to the commodity's low value-to-weight ratio, making long-haul imports economically marginal for that grade.
National industry 3 of 3 in naics industry 21231
National industry 212312 · $89K of $32.8M
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Imports · August 2026
origin
China and Vietnam together supply 79% of it. Brazil pays 37.5% duty; Canada 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census publishes state breakdowns for NAICS to the 4-digit level only. See NAICS 2123 for those.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$89KYoY · free account
Exports
$100KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.4M of Limestone Mining & Quarrying and exported $719K.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026. Source: U.S. Census Bureau.