U.S. imports of Ground or Treated Mineral & Earth (NAICS 327992) totaled $43.8M in August 2026, imported from 40 countries.
Importers of Ground or Treated Mineral & Earth paid $1.1M in duties in August 2026, an average duty rate of 2.67% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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.
1.2K import shipments a month
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.
National industry 4 of 4 in naics industry 32799
National industry 327992 · $43.8M of $635.9M
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Imports · August 2026
origin
Indonesia and Canada together supply 41% 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
$43.8MYoY · free account
Exports
$31.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $495.3M of Ground or Treated Mineral & Earth and exported $319.3M.
Through August 2026. Source: U.S. Census Bureau.