2022 NAICS national industry in sector 31-33 Manufacturing
327992 Ground or Treated Mineral and Earth Manufacturing
NAICS 327992 is the US industry code for ground or treated mineral and earth manufacturing. This U.S.
- Code
- 327992 (2022 NAICS)
- Title
- Ground or Treated Mineral and Earth Manufacturing
- Part of
- All Other Nonmetallic Mineral Product Manufacturing
- SBA small business limit
- Up to 600 employees
- Closest UK SIC
- 23990 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This U.S. industry comprises establishments primarily engaged in calcining, dead burning, or otherwise processing beyond beneficiation, clays, ceramic and refractory minerals, barite, and miscellaneous nonmetallic minerals.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in crushing, grinding, pulverizing, washing, screening, sizing, or otherwise beneficiating mined clays, ceramics and refractory, and other miscellaneous nonmetallic minerals are classified in Industry Group 2123, Nonmetallic Mineral Mining and Quarrying.
Activities listed under 327992
The Census index assigns these 22 activities to this code. If your business matches one, this is your code.
- Barite processing beyond beneficiation
- Barium processing beyond beneficiation
- Blast furnace slag processing
- Desiccants, activated clay, manufacturing
- Diatomaceous earth processing beyond beneficiation
- Feldspar processing beyond beneficiation
- Flint processing beyond beneficiation
- Fuller's earth processing beyond beneficiating
- Graphite, natural (e.g., ground, pulverized, refined, blended), manufacturing
- Kaolin, processing beyond beneficiation
- Lead, black (i.e., natural graphite), ground, refined, or blended, manufacturing
- Magnesite, crude (e.g., calcined, dead-burned, ground), manufacturing
- Mica processing beyond beneficiation
- Perlite aggregates manufacturing
- Perlite, expanded, manufacturing
- Pumice (except abrasives) processing beyond beneficiation
- Pyrophyllite processing beyond beneficiation
- Shale, expanded, manufacturing
- Silicon, ultra high purity, manufacturing
- Soapstone processing beyond beneficiation
- Talc processing beyond beneficiation
- Vermiculite, exfoliated, manufacturing
SBA size standard for 327992
To count as a small business for SBA loans and federal contracts under NAICS 327992, your business (including affiliates) must not exceed 600 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2399), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.