stock might jump 30 to 40% but should be shorted then
while perhaps "non-core" the company is selling a large asset at a fire sale price in order to prop up liquidity. I don't think there's much to celebrate of this forced sale. Short term investors will be happy that the company has bought another life line but excitement will soon wane with the company facing the same problems as before and will be stripped of an lucrative asset going forward should coal markets improve one day.
actually I think short sellers will use this invitation to add to or open new positions and bring the stock back to unchanged or even lower this afternoon. The sale does nothing to fix the inherent problems of the core business.