Copper ores are minerals that contain a significant amount of copper. Among the options provided:
- Bornite is a copper ore mineral, often referred to as "peacock ore" because of its iridescent colors.
- Pentlandite is a nickel ore, not a copper ore.
- Gahnite is an aluminum oxide mineral, not related to copper.
- Covellite is a copper sulfide mineral and a secondary copper ore.
Thus, the correct answer is (A) and (D).