Here's why:

* Ore: An ore is a naturally occurring solid material from which a valuable mineral can be extracted profitably. The valuable mineral is called the ore mineral, and the remaining material is called gangue.

* Useful Minerals: These are minerals that have economic value because they can be used in various industries. Examples include iron ore (for steel production), copper ore (for electrical wiring), and gold ore (for jewelry and electronics).

So, any rock containing a mineral that can be mined and processed for its valuable components is considered an ore.