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    				| 1. | hydralic wash method | 
| Answer» The name hydraulic means “operated by the pressure created by forcing water (or) another liquid”. Washing ore with water is known as hydraulic washing. Gold mines make use of the hydraulic washing technique. An upward stream of running water is used to wash powdered ore. The lighter particles of the gangue are washed away and the heavier ore is left behind. This technique separates the gangue from the ore using the difference in their specific gravities. It is, also known as gravity separation. | |