I think the creator of these videos might be slightly optimistic if he expects to catch any serious quantity of gold with these machines but it is a good display of the equipment in action. In the first video you’ll see a 1:12 Scale Hitachi excavator working working to collect pay dirt from a river. The undercarriage of this model must be entirely hydraulic or they wouldn’t risk it in the water.
In the second video the pay dirt is at the plant ready for processing and there is a number of different vehicles ready for the job.