This was a very bad day for mining stocks, though POG was pretty much flat and base metals prices were mixed. Fundamentally, I don't think anything changed for mining stocks. They just happen to have been taken down with the sell off of stocks in general.
TMBXF was lower too, closing at a price tied with it's lowest price ever. Anything lower for them will be new territory, and without news that ain't healthy for them.
LBSR closed up, but prices changes at these volume levels are meaningless, IMO.