Those that cannot be beneficiated are: silver mine, gold mine, real silver mine, black iron mine, constant gold mine and krypton gold mine. And all other mission minerals.
During mineral processing, the number of mineral processing should be at least five, that is, five ores should be selected at a time. Mineral processing is related to the grade of jewelry. For example, the jewelry skill of 100 can't be used for color tone mineral processing because the jewelry skill is not enough.
The selected gems are random, but the basic ore grade corresponds to the gem grade. For example, if copper ore is used for mineral processing, the selected gems can only be tiger's eye stone, malachite and the like, and there can be no high-grade gems such as Azeroth diamond and big opal stone. Similarly, high-grade ores can't distinguish low-grade gems. In the process of practicing jewelry, there is often a shortage of gems, because mining alone can't dig a few. At this time, go to your mine and find them through mineral processing.