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Gold extraction - Wikipedia, the free encyclopedia

1 History; 2 Types of ore; 3 Concentration; 4 Leaching; 5 Refractory gold processes; 6 Gold smelting. 6.1 History of smelting; 6.2 Mercury removal; 6.3 Iron removal ...

process metallurgy -- Encyclopedia Britannica

The production of aluminum from bauxite is a two-step process: refining bauxite to obtain alumina and smelting alumina to produce aluminum. Bauxite contains a …

Copper extraction techniques - Wikipedia, the free ...

Most copper ores contain only a small percentage of copper metal bound up within valuable ore minerals, with the remainder of the ore being unwanted rock or gangue ...

Full text of "Science (Std10 - English Medium)"

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