That's how it works, Outer.
As long as they continue milling that bond is like money in the bank. They can stop milling and sell it off and the bond remains in effect, AFAIK. But once they try to get the money back by starting the reclamation process - the permit process has to start again with new bond requirements.
It's a good thing for the most part. Keeps companies from packing up and leaving a mess. We can also think of it as equity.
Whether or not the State puts a cash bond in an interest bearing account, well, I'll leave that up to speculation.
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