SIC 3331 — Primary Smelting and Refining of Copper
Description & Classification
SIC code 3331 representing 'Primary Smelting and Refining of Copper' is an industry category in the Standard Industrial Classification (SIC) system under U.S. OSHA and Federal procurement registers.
Modern NAICS Crosswalk
Trace the modern equivalent classifications in the 2022 North American Industry Classification System (NAICS) database:
- NAICS 331410 - Nonferrous Metal (except Aluminum) Smelting and Refining (via SIC1987:3331→NAICS1997:331411→2002:331411→2007:331411→2012:331410→2017:331410→2022:331410)
Classification Details
| SIC Code | 3331 |
|---|---|
| Industry Title | Primary Smelting and Refining of Copper |
| Division | Division D: Manufacturing |
| Major Group | Major Group 33: Primary Metal Industries |
| Source / Verified | US Census 1987 SIC Concordance / 2026-06-28 |
Related Resources & Compliance Guides
Further regulatory reference links for legacy SIC code 3331:
- SIC Codes Complete Compliance Guide — Detailed history and active legal applications of the SIC classification framework.
- Why Legacy SIC Codes Persist Guide — How credit systems and the SEC still rely on SIC metadata.
- SIC ↔ NAICS Crosswalk Tool — Trace industrial code conversions dynamically.
- SIC Major Group 33 Hub — View other legacy industries in this business division.
Related Industries in Major Group 33
Frequently Asked Questions (FAQ)
What industry does SIC code 3331 represent?
SIC 3331 is 'Primary Smelting and Refining of Copper', a 4-digit Standard Industrial Classification (SIC) code under Major Group 33: Primary Metal Industries (Division D: Manufacturing); it maps to modern 2022 NAICS code(s): 331410 (Nonferrous Metal (except Aluminum) Smelting and Refining).
What is the modern 2022 NAICS mapping for SIC 3331?
SIC code 3331 maps to modern NAICS codes: 331410 - Nonferrous Metal (except Aluminum) Smelting and Refining.