Zhao, Qian, and Sun are identifying a piece of ore. Zhao said, "This is not iron or lead. " Qian said, "This is not iron, but copper. " Sun said, "This is not copper, but "Iron. " It is known that one of them was right, one was wrong, and one was only half right. Based on the above, which of the following is true? ['This ore is a silver mine.', 'This ore is copper.', 'This mine is iron right.', 'This ore is a lead mine.']