Categories of mineral resources
❖ Undiscovered: unspecified bodies of mineral bearing material surmised to
exist based on broad general knowledge and theory
❖ Hypothetical: undiscovered materials reasonable expected to exist in a
known mining district under known geological conditions
❖ Speculative: undiscovered material that may occur either known types of
deposits in favorable geological settings where no discoveries have been
made, or in yet unknown types of deposits that remain to be recognized