After the ore has been sorted, most of the gangue and impurities are removed, and the product in which the useful minerals are enriched to the specified grade is called concentrate. Ore beneficiation plant is the final product, sometimes called the final concentrate, generally as a raw material smelting. In the final concentrate, the main components and impurities content meet the national standards, which can be called qualified concentrate. As a product of a single metal gold mine, Au grade of not less than 140 g / t, As is not more than 0.1% grade; a product of multi-metal gold mine, Au grade of not less than 80 g / t, As The grade is no more than 0.2%.
After the ore is processed by the sorting operation, its main components have been enriched in the concentrate, and its secondary components or other associated metals are also comprehensively recovered; the remaining part contains very low content, and this part of the product is called tail mineral. Or the final tailings. It should be noted that the tailings still contain a small amount of useful ingredients that cannot be recycled due to current technical conditions and may become a raw material for reuse in the future. Therefore, the tailings are generally stored in the tailings inventory.
The intermediate product obtained during the sorting process is called the middle mine. The useful content of the medium ore is generally between the concentrate and the tailings, neither as the final tailings nor as the final concentrate. In general, the mine is to be returned to the appropriate location in the process for reprocessing or to be disposed of separately.

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