minéral à valeur commerciale

CONT: In the geological and mining sense, economic minerals are defined as naturally occurring substances which can be extracted at a profit, although in some countries profitability may not be recognized as an overriding factor, and in such cases extraction is usually undertaken instead at the lowest possible cost.
CONT: Of the three classes of economic minerals (metallic minerals, mineral fuels, and industrial minerals), metallic minerals are those that may be used as a source of one or more metals.