The point with mining equipment is that while the loads are huge, speed and distances are not. So the total amount of power needed is not that big. Drivetrains are already electric and the power is provided by on-board generators that could easily be replaced by batteries, that only have to be recharged at night.
And in some cases they never need to be recharged at all, like here:
https://www.firstpost.com/tech/science/worlds-largest-electric-vehicle-is-a-110-tonne-dump-truck-that-needs-no-charging-7190131.html
There ain't no such thing as a free lunch, but this gets as close to freeloading as possible. That thing there is much greener than meets the eye.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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