Multiple choice Which is the chief ore of copper? Galena Chalcopyrite Sphalerite Siderite Reveal answer Fill a bubble to check yourself B Correct answer Explanation The main copper sulphide minerals are chalcopyrite (CuFeS2) chalcocite (Cu2S), covellite (CuS), bornite (Cu5FeS4), tetrahedrite ((Cu,Fe)12Sb4S13) and enargite (Cu3AsS4).