Right. Re-running tailings is very costly for the amount of return because, for the most part, all of the gold has already been collected from the tailings. So they lament losing the gold, for sure, but to re-run the tailings wouldn't probably recover enough gold to cover the cost of the fuel. It's a situation where they don't want to lose ANY gold on the first pass through, because the cost to run the plant is already there. Recovering lost gold from tailings means the plant has to be run a second time for a tiny return.
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Shooting has started on my latest movie: http://www.imdb.com/title/tt5531336/
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