Term to explain a resource whose size and grade has been estimated on limited sampling data. Often used in the early stage of exploration.

An ore mineral of titanium, being an iron-titanium oxide.

Non-metallic, non-fuel minerals used in their natural state in the chemical and manufacturing industries. They need some beneficiation.

Term to describe the size of a resource that has had exploration drill holes spaced closely enough together to reasonably indicate that it has a continuous size and depth.