The word(s) "copper" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Pickthal translation.

(1) Give me pieces of iron - till, when he had levelled up (the gap) between the cliffs, he said: Blow! - till, when he had made it a fire, he said: Bring me molten copper to pour thereon.

(سورة الكهف, Al-Kahf, Chapter #18, Verse #96)
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(2) And unto Solomon (We gave) the wind, whereof the morning course was a month's journey and the evening course a month's journey, and We caused the fount of copper to gush forth for him, and (We gave him) certain of the jinn who worked before him by permission of his Lord. And such of them as deviated from Our command, them We caused to taste the punishment of flaming Fire.

(سورة سبإ, Saba, Chapter #34, Verse #12)
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(3) The day when the sky will become as molten copper,

(سورة المعارج, Al-Ma'aarij, Chapter #70, Verse #8)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)