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The operations were usually terminated by the autumn floods.
![gold rush thistle creek dredge on dry ground gold rush thistle creek dredge on dry ground](https://sc01.alicdn.com/kf/HTB1kByRMpXXXXXxXXXXq6xXFXXXz/200459932/HTB1kByRMpXXXXXxXXXXq6xXFXXXz.jpg)
The river bed exposed by such methods was prospected and the pay-dirt when found taken out and washed, particular attention being paid to the surface of the bed-rock. Sometimes wing-dams were built out from the bank above and below the part of the river it was desired to work, and a third dam connecting their mid-stream ends was constructed parallel to the direction of the current. Sometimes, tunnels were made to drain permanently large reaches and deliver the water at a lower point. This was usually done by building two dams from bank to bank, with their foundations on bedrock, the water being carried off in a wooden flume, starting above the head-dam and terminating below the foot-dam. In river mining, an entire river was frequently deflected from its course so as to lay bare a section of its bed.
![gold rush thistle creek dredge on dry ground gold rush thistle creek dredge on dry ground](http://2.bp.blogspot.com/-In7sr7uZ5QQ/TxL9vs_qeII/AAAAAAAABD0/hg6bPzPZSQA/s1600/AerialViewDredgeAtFlatAK1988.jpg)
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Gold dredging in now practised on the rivers of California, has is now superseded river mining. To understand How Does a Gold Dredge Work, we may want to start by looking at California or Alaska.
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