This method of recovering gold from the gravel of river beds has of late years made remarkable progress, and its extension to the working of all flat placers has completely changed the aspect of shallow alluvial mining. The gravel won by either of these three methods is washed in the usual way by sluicing. Pits are sunk on the bank, and the gravels below water level excavated and raised to the surface by ordinary mining methods, or by the hydraulic elevator.
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