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NAICSSector 32
U.S. imports of ground or treated mineral & earth (NAICS 327992) totaled $51.6M in July 2026, traded with 40 countries.
Importers of Ground or Treated Mineral & Earth paid $569K in duties in July 2026 — an effective duty rate of 12% on $4.9M in dutiable value, based on actual customs collections rather than the published tariff schedule. Ground or Treated Mineral & Earth imports of $51.6M in July 2026 ran 25% above the year-to-date monthly average of $41.4M.
Last updated: July 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.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.0K shipments/mo
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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National industry 4 of 4 in naics industry 32799
National industry 327992 · $51.6M of $687.0M
Imports · July 2026
origin
China and Canada together supply 62% of it.
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 3279 for those.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$51.6MYoY · Pro
Exports
$27.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.