It is called minerals of economic value. Such as pyrite, galena, chalcopyrite, smitsonite, cerusite, scheelite… Increasing the percentage of precious elements and decreasing the percentage of harmful elements is achieved by removing the residual materials in the ore. In this method, since the remaining part will be enriched in terms of precious minerals with the disposal of the residual material, this method is called the method of enriching valuable minerals.