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Interesting film.
What I didn't catch watching it is, how does the potash mining affect the salt track surface used by the racers? Is the potash being mined on the race track itself, or off to the side of the track?
It seems that the answer has to be that the potash is being mined on the race track itself if, in fact, the mining is reducing the thickness of the salt layer specifically on the track.
But if the race track is being dug up to reach the potash, how is there any salt left on the track to run on, since it is not being replaced after mining? And how does the salt get flat enough to race on again after the potash has been dug up and removed from the track?
In any case, at least the potash is going for a good cause: making fertilizer vital to food production.
Hopefully, a solution can be found. The racing does provide a lot of fun for the participants, and it may even to some degree provide useful knowledge for the automotive industry.
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