N00bie here, but I just re-watched 'Pale Rider.' (1985, Clint Eastwood)
Nice setting (shot in the Sawtooth National Recreation Area in central Idaho) and although the dialog mentions a lot of panning, you can see sluices and rocker boxes in the background, and the 'bad guys' are doing some good old-fashioned hydraulic mining with recirculating pumped water, high-pressure nozzles, and a sluice with maybe about 150 yards of riffles. They try to stuff a little enviro-religion into the movie, showing the hoses taking down trees by their roots, but I still felt that must have been glorious back in the day.
Interesting use of the word 'monitor' to mean a somewhat portable steam engine (for nozzle pressure,) similar to the old logging 'steam donkeys' up here in lumber country. (Western Oregon.)
Oh yeah, "Nothing like a good piece of hickory."