A large nugget from the Lowhee hydraulic mine clean-up in 1942 weighed ~ 583.5 grams (18.75 ounces; Fig.
A large artificial delta was created at the east end of Jack of Clubs Lake by millions of cubic metres of tailings flushed out of the hydraulic mine on Lowhee Creek.
In effect, he was the only significant operator with hydraulic mines other than Thistle Mines on Eight Mile Creek.
The 4.5 Mt/y Ordzhonikidzeugol (10 mines) commissioned the first hydraulic mine in the Soviet Union, back in 1939.
Included in Prokopyevskgidrougol's 14 underground mines (18 Mt/y of steaming and coking coal) are two hydraulic mines. The first, Tyrganskaya (1.1 Mt/y) was developed in the mid-1950s; the second, Yubileynaya (1.4 Mt/y), about 12 years later.
By the 1880s, the Yuba River was so full of detritus from hydraulic mines
farther upstream that its bed was a full thirty feet above what it had been in 1850, with disastrous consequences for the adjacent countryside.