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cut-off grade;marginal grade;stoping limit tenor
Molecular formula :

nature : also known as marginal grade. Mineral Industry Indexes of a content refers to the calculation of mineral reserves at the orebody delineation of individual mineral samples useful components in the minimum requirements, as a division of mine with (rock or folder rock) boundaries of the standards. Border grade should be higher than mine tailings of the content of useful components, and with progress in science and technology and the market demand changes.

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