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11 September, 20:14

Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process. a) as a method of the extraction of minerals, it was well establishedb) as a method of the extraction of minerals well establishedc) was a well-established method of mineral extractiond) was a well-established method of extracting mineral that wase) had been a method of mineral extraction, well established

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  1. 11 September, 22:02
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    d is correct

    Explanation:

    In metallurgy, the leaching is a method in which it can be separated two or more metals from the main ore. The use of bacteria contribute to this process because some microorganism can oxidize secondary products, leaving just the mineral that is important in the process.

    Also the bacteria can digest some products that can polluted the environment as the carbon dioxide, sulfur toxic gases, among others. In this way, this "wastes" are the food of the bacteria and they can transform them into substances that are not harmful.
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