... aerobic conditions. Bacterial Leaching has been divided into two mechanisms:- * Direct Mechanism: - Direct mechanism is that in which bacteria is physically attached to the mineral surface. In this reaction, the electron passes into the bacterial cell which produces ATP (Adenotriphosphate), is the energy currency of the cell which reduces oxygen molecules to water. Thiobacillus attached directly to the mineral surface * Indirect Mechanism: - In indirect mechanism, bacteria do not need to be in contact with mineral surface. (200 words) Extraction of metal (Copper & Gold) from its ores:- Crushing & Grinding:- The ore is put into mills with liquid (mostly water). The mill rotates causes ores and liquid to crush against one another, which breaks the ores into smaller pieces. The solution after crushed and grinding is called slurry. Flotation &Thickener:- Liquids called reagents in which one attracts metal and other makes bubbles are added to the slurry in a large container in the presence of ...

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