Hydraulic extraction
The hydraulic extraction consists in using water under pressure to erode rocks or to stir up sediments. Water cannons were used the first time in California in 1853 to exploit the layers at the time of the gold rush.
It should be noted that the Romains used already hydraulic techniques to extract the invaluable ore. The remarkable site of Tired Médulas at summer the theater of the Roman minère activity. Basins were contruits in height. When water was slackened, of a blow, it descended the slopes or penetrated in galleries and tore off there the friable rock which was treated low. To convey water, the Romans had built a network of drains of more than 300 km.
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