… Copper ores and concentrates. …
Explanatory notes
… 26.03 ‑ C opper ores and concentrates. The principal ores generally classified in this heading are : (a) Atacamite, natural copper hydroxychloride. (b) … , cuprous oxide. (l) Dioptase , copper silicate. (m) Grey copper ore (often silver‑bearing), a sulphide of copper …