Hydraulic mining is another system for obtaining ores from alluvial deposits. a stream of water is shot under pressure from a large nozzle in a particular direction. This nozzle is called a hydraulic giant.

• 水力开采是从冲积矿床中获取矿石的又一种方法。加压水流从一个大喷嘴朝特定的方向射出。这个喷嘴称为水枪。