Selective Mining

selective mining

[si′lek·tiv ′mīn·iŋ] (mining engineering) A method of mining whereby ore of unwarranted high value is mined in such manner as to make the low-grade ore left in the mine incapable of future profitable extraction; in other words, the best ore is selected in order to make good mill returns, leaving the low-grade ore in the mine.

Selective Mining

the separate extraction of useful minerals that occur together or the separate extraction of valuable minerals and gangue. Selective mining ensures the most complete extraction of a useful mineral with minimal depletion, but it increases the costs of extraction and complicates the organization of mining operations.

Deposits with complex structures are selectively worked by blasting blocks without disturbing the geological structure, by blasting the various useful minerals and gangue separately, by blasting along the contact areas of ore bodies and gangue, by blasting and separating layers of rocks simultaneously, and by loosening layers of rocks by means of rippers. Blasted rocks are removed from the face by means of controlled caving, selective vertical or horizontal excavation, sorting within the face, and combined removal. Selective mining is especially efficient when valuable ores are mined because it permits a significant improvement in the quality of the rock mass to be concentrated.

单词	selective mining
释义	Selective Mining selective mining [si′lek·tiv ′mīn·iŋ] (mining engineering) A method of mining whereby ore of unwarranted high value is mined in such manner as to make the low-grade ore left in the mine incapable of future profitable extraction; in other words, the best ore is selected in order to make good mill returns, leaving the low-grade ore in the mine. Selective Mining the separate extraction of useful minerals that occur together or the separate extraction of valuable minerals and gangue. Selective mining ensures the most complete extraction of a useful mineral with minimal depletion, but it increases the costs of extraction and complicates the organization of mining operations. Deposits with complex structures are selectively worked by blasting blocks without disturbing the geological structure, by blasting the various useful minerals and gangue separately, by blasting along the contact areas of ore bodies and gangue, by blasting and separating layers of rocks simultaneously, and by loosening layers of rocks by means of rippers. Blasted rocks are removed from the face by means of controlled caving, selective vertical or horizontal excavation, sorting within the face, and combined removal. Selective mining is especially efficient when valuable ores are mined because it permits a significant improvement in the quality of the rock mass to be concentrated.
随便看	muscle hemoglobin muscle hernia muscle her out of muscle him out of muscle hypertonia muscle hypertrophy muscle hypotonia muscle impulse muscle in muscle inflammation muscle in on muscle in on her muscle in on him muscle in on it muscle in on me muscle in on one muscle in on (someone or something) muscle in on them muscle in on us muscle in on you muscle insulin-mediated glucose uptake muscle into muscle layer in fatty layer of subcutaneous tissue muscle layer of pharynx muscle length