AXG - Antipodes Gold [formerly GEL - Glass Earth]

[elZorro]

GRU#1 looks to have two circular jigs on the underneath of it, see jig video. The same arm drives both jigs, in reciprocal motion.

Here is a modern jig set with electronic control.

http://www.rmsross.com/overview/circular-jigs.html

The stroke height and stroke speed of the jig is critical for the capture of fine gold, and needs to be tuned for every prospect, along with the water flow, mesh sizes and table angles. This would be hard to do if they're all mechanical adjustments. I don't have a clue as to what the two GRUs are using for specific equipment, so we'll have to wait and see what is reported.

1995 basic data on jigs.