Analysis
HTS 7402.00.00 covers unrefined copper; copper anodes for electrolytic refining under heading 7402 (unrefined copper; copper anodes for electrolytic refining).
There is no general-rate duty on this line, which puts it with roughly 12% of the 89 tariff lines in chapter 74 that are also free. Duty-free at the general rate does not rule out additional duties under Chapter 99, such as Section 301 or Section 232 measures, which depend on the country of origin.
It is the only US line under subheading 7402.00, so the six-digit code used by every Harmonized System country and the eight-digit US line describe the same goods; a foreign tariff or an exporter's invoice showing 7402.00 points straight here.
Census statistics map these goods to NAICS 331410 (Nonferrous Metal (except Aluminum) Smelting and Refining), an industry of 112 US establishments employing 8,755 people, the industry a domestic producer of these goods reports under.
Goods from countries without normal trade relations pay the column 2 rate of 6% instead of nothing, so origin decides between free entry and a 6% duty.