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NAICSSector 32
U.S. imports of ground or treated mineral & earth (NAICS 327992) totaled $29.8M in April 2026, traded with 37 countries.
Importers of Ground or Treated Mineral & Earth paid $660K in duties in April 2026 — an effective duty rate of 12% on $5.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Ground or Treated Mineral & Earth imports of $29.8M in April 2026 ran 26% below the year-to-date monthly average of $40.1M.
Last updated: April 2026 dataProcessed industrial minerals — including ground calcium carbonate, kaolin, talc, barite, and treated clays — serve as functional fillers, coatings, and performance additives across paper, plastics, paint, rubber, and ceramics manufacturing. The trade profile for these materials is driven by deposit geography and processing infrastructure, with certain grades commanding significant price premiums based on particle size, brightness, or chemical purity. HTS classification turns on the specific mineral identity and degree of processing, as crude and refined forms of the same mineral can fall in different chapters with different duty treatment.
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Crude or merely crushed minerals are typically classified in HTS Chapter 25, while minerals that have been calcined, purified, surface-treated, or otherwise processed beyond simple size reduction may shift to Chapter 28 or 38. The boundary between 'merely prepared' and 'chemically processed' is a recurring classification dispute for materials like kaolin, talc, and calcium carbonate.
Particle size distribution (median diameter and top-cut), brightness or whiteness index, chemical purity, and moisture content are the primary specification parameters. For paper-coating grades of kaolin or calcium carbonate, brightness and particle size directly determine pricing and suitability for end-use applications, making certificate-of-analysis review a standard part of the import transaction.
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Monthly import values over time
No geographic breakdown available
U.S. trade for this product is not broken down by state or port in the latest Census Bureau release.