My guess is that they've been waiting for the price of Antimony to reach a certain level to make it more feasible to both profit from, and to encourage new investment in the company.
As Caveat has pointed out, at one point they were thinking about insolvency, now they have decided to attempt to move forward. I'm guessing that has a lot to do with the rise in the price of antimony and increased demand for a US source of Antimony.
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